diff --git a/docs/README.md b/docs/README.md
index 3b9c1a5..958a43c 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,16 +1,106 @@
 # Matrix
 
-## How to use
-- Clone the project using ```git clone https://github.com/tskxz/matrix``` 
-- install packages using ```pip install -r requirements.txt``` or using these following commands
-```
-python3 -m venv venv
-source ./venv/bin/activate
-pip install -r ./requirements.txt
+Matrix is a web-based matrix calculator built with Flask. It provides a user-friendly interface to perform a wide range of matrix operations, from basic arithmetic to advanced applications like message encryption and decryption.
+
+## Features
+
+- **Basic Arithmetic:** Addition, subtraction, and multiplication of matrices.
+- **Scalar Operations:** Multiply a matrix by a scalar value.
+- **Advanced Calculations:**
+    - Matrix Transpose
+    - Determinant (for square matrices of any size via Laplace expansion)
+    - Matrix Inverse (using the adjugate method)
+- **Cryptography:**
+    - Encrypt text messages using an invertible encoding matrix (a form of Hill Cipher).
+    - Decrypt messages using the inverse of the encoding matrix.
+- **Dynamic UI:** The interface dynamically generates input fields based on user-specified matrix dimensions.
+- **Data Export:** Export the results of operations (including the input matrices) to JSON, XML, or HTML formats.
+- **Error Handling:** Validates matrix dimensions and mathematical conditions (e.g., non-singular matrices for inversion) and provides clear error messages.
+
+## Technology Stack
+
+- **Backend:** Python, Flask
+- **Frontend:** HTML, CSS, JavaScript (Vanilla)
+- **Math Engine:** Custom `Matrix` class with core logic in Python.
+- **Testing:** Pytest
+- **CI/CD:** GitHub Actions
+
+## Installation and Usage
+
+To get a local copy up and running, follow these steps.
+
+1.  **Clone the repository:**
+    ```sh
+    git clone https://github.com/tskxz/matrix.git
+    cd matrix
+    ```
+
+2.  **Create and activate a virtual environment:**
+    - On macOS/Linux:
+      ```sh
+      python3 -m venv venv
+      source venv/bin/activate
+      ```
+    - On Windows:
+      ```sh
+      python -m venv venv
+      .\venv\Scripts\activate
+      ```
+
+3.  **Install dependencies:**
+    ```sh
+    pip install -r requirements.txt
+    ```
+
+4.  **Run the application:**
+    ```sh
+    python app.py
+    ```
+
+5.  Open your browser and navigate to `http://127.0.0.1:5000`.
+
+## Running Tests
+
+The project includes a suite of unit tests to ensure the correctness of the matrix operations. To run the tests:
+
+```sh
+python -m pytest tests/ -v -s
 ```
-- then proceed to run ```python app.py```
 
-## Run unit tests
+## Project Structure
+
+The repository is organized as follows:
+
+```
+├── app.py                  # Main Flask application with all routes
+├── core/
+│   └── matrix.py           # Core Matrix class with all mathematical logic
+├── static/
+│   ├── css/                # CSS stylesheets
+│   └── js/                 # Frontend JavaScript for each operation
+├── templates/              # HTML templates for the web interface
+├── tests/
+│   ├── test_matrix.py      # Unit tests for the Matrix class
+│   └── test_routes.py      # Unit tests for the Flask routes
+├── docs/                   # System analysis, diagrams, and documentation
+├── requirements.txt        # Python dependencies
+└── .github/                # CI workflows and PR templates
 ```
-python -m pytest tests/test_matrix.py -v -s
-```
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+
+## Cryptography Implementation
+
+The application uses matrix multiplication for encryption and decryption, a method similar to the Hill Cipher.
+
+1.  **Character Mapping:** Each character in the message is converted to a number based on a predefined map (`A=1, B=2, ..., ' '=29`).
+2.  **Message Matrix:** The resulting sequence of numbers is organized into a matrix (`M`). The number of rows of this matrix matches the dimensions of the encoding matrix.
+3.  **Encryption:** The message matrix `M` is multiplied by a user-provided, invertible *encoding matrix* `A` to produce the *encrypted matrix* `N`.
+    - `N = A * M`
+4.  **Decryption:** To recover the original message, the encrypted matrix `N` is multiplied by the inverse of the encoding matrix, `A⁻¹`.
+    - `M = A⁻¹ * N`
+5.  **Conversion to Text:** The numbers in the resulting matrix `M` are converted back to characters to reveal the original message.
+
+An encoding matrix must be invertible (i.e., its determinant must be non-zero) for decryption to be possible. The application validates this condition before performing any encryption.
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.
diff --git a/static/js/matrix-builder.js b/static/js/matrix-builder.js
index 4e90f97..5cb9879 100644
--- a/static/js/matrix-builder.js
+++ b/static/js/matrix-builder.js
@@ -4,6 +4,45 @@ function generateMatrixInput(rows, cols, containerId, label, gridId) {
   const section = document.createElement('div');
   section.className = 'matrix-section';
   section.innerHTML = `<h3>${label}</h3>`;
+
+  const header = document.createElement('div');
+  const importBtn = document.createElement('button');
+  const fileInput = document.createElement('input');
+  importBtn.textContent = 'Importar CSV';
+  importBtn.type = 'button';
+  fileInput.type = 'file';
+  fileInput.accept = '.csv,text/csv';
+  fileInput.style.display = 'none';
+  fileInput.dataset.matrixId = gridId;
+
+  importBtn.addEventListener('click', function() {
+    fileInput.click();
+  });
+
+  fileInput.addEventListener('change', function(event) {
+    const file = event.target.files[0];
+    if (!file) return;
+    
+    const reader = new FileReader();
+    
+    reader.onload = function(e) {
+      const csvText = e.target.result;
+      importMatrixFromCSV(csvText, gridId, rows, cols);
+    };
+    
+    reader.onerror = function() {
+      showError('Erro ao ler o ficheiro CSV.');
+    };
+    
+    reader.readAsText(file);
+    
+    event.target.value = '';
+  });
+
+  header.appendChild(importBtn);
+  header.appendChild(fileInput);
+
+  section.appendChild(header);
   
   const grid = document.createElement('div');
   grid.className = 'matrix-input-grid';
diff --git a/static/js/utils.js b/static/js/utils.js
index b075911..4281f7e 100644
--- a/static/js/utils.js
+++ b/static/js/utils.js
@@ -84,4 +84,76 @@ function prettyHTML(matrix, title) {
 
   html += '</table>';
   return html;
+}
+
+function importMatrixFromCSV(csvText, matrixId, expectedRows, expectedCols) {
+  try {
+    // Divide o CSV em linhas
+    const lines = csvText.trim().split('\n').filter(line => line.trim() !== '');
+    
+    if (lines.length === 0) {
+      throw new Error('Arquivo CSV vazio.');
+    }
+    
+    // Parse da matriz
+    const matrix = lines.map(line => 
+      line.split(',').map(num => {
+        const val = num.trim();
+        return val === '' ? 0 : parseFloat(val);
+      })
+    );
+    
+    // Verifica se todas as linhas têm o mesmo número de colunas
+    const cols = matrix[0].length;
+    if (!matrix.every(row => row.length === cols)) {
+      throw new Error('Todas as linhas devem ter o mesmo número de elementos.');
+    }
+    
+    // Verifica se as dimensões correspondem às esperadas
+    if (expectedRows && expectedCols) {
+      if (matrix.length !== expectedRows || cols !== expectedCols) {
+        throw new Error(`Dimensões incorretas. Esperado: ${expectedRows}x${expectedCols}, Obtido: ${matrix.length}x${cols}`);
+      }
+    }
+    
+    // Preenche os inputs da matriz
+    for (let i = 0; i < matrix.length; i++) {
+      for (let j = 0; j < matrix[i].length; j++) {
+        const input = document.querySelector(`#${matrixId} [data-row="${i}"][data-col="${j}"]`);
+        if (input) {
+          input.value = matrix[i][j];
+          input.dispatchEvent(new Event('input'));
+        }
+      }
+    }
+    
+    showSuccess(`Matriz ${matrixId === 'matrix-a' ? 'A' : 'B'} importada com sucesso!`);
+    
+  } catch (error) {
+    console.error('Erro ao importar CSV:', error);
+    showError('Erro ao importar CSV: ' + error.message);
+  }
+}
+
+function showSuccess(message) {
+  hideError();
+  const successDiv = document.createElement('div');
+  successDiv.className = 'success-message';
+  successDiv.textContent = message;
+  successDiv.style.margin = '0.5rem 0';
+  successDiv.style.padding = '0.5rem';
+  successDiv.style.backgroundColor = '#d4edda';
+  successDiv.style.color = '#155724';
+  successDiv.style.border = '1px solid #c3e6cb';
+  successDiv.style.borderRadius = '0.25rem';
+  successDiv.style.fontSize = '0.9rem';
+  
+  setTimeout(() => {
+    if (successDiv.parentNode) {
+      successDiv.parentNode.removeChild(successDiv);
+    }
+  }, 3000);
+  
+  const form = document.getElementById('matrix-form');
+  form.parentNode.insertBefore(successDiv, form.nextSibling);
 }
\ No newline at end of file