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+### Project Development Guide
+
+This document provides essential information for developers working on the PhotoBook project.
+
+### Build & Configuration
+
+The project uses Docker for local development, managed via a `Makefile`.
+
+#### Prerequisites
+- Docker and Docker Compose (v2.x)
+- `make` utility
+
+#### Initial Setup
+To set up the project for the first time:
+```bash
+make setup
+```
+This command builds the images, creates the `.env` file, starts the containers, generates the application key, runs migrations, and seeds the database.
+
+#### Common Commands
+- **Start project**: `make up`
+- **Stop project**: `make down`
+- **Access PHP container shell**: `make sh`
+- **Build images**: `make build-images`
+- **Run phpunit**: `make phpunit`
+- **Run linter**: `make lint`
+
+### Testing
+
+The project uses PHPUnit for testing. Configuration is located in `phpunit.xml`.
+
+#### Running Tests
+To run tests, you must execute them within the PHP container.
+
+**Running all tests:**
+```bash
+make sh
+./vendor/bin/phpunit
+```
+Or from the host:
+```bash
+make phpunit
+```
+
+#### Adding New Tests
+- **Unit Tests**: Place in `tests/Unit/`. Class names should end with `Test.php`.
+- **Feature Tests**: Place in `tests/Feature/`. Class names should end with `Test.php`.
+
+Example of a simple Unit Test:
+```php
+<?php
+
+namespace Tests\Unit;
+
+use Tests\TestCase;
+
+class MyNewTest extends TestCase
+{
+    public function test_something_works()
+    {
+        $this->assertTrue(true);
+    }
+}
+```
+
+### Code Quality and Style
+
+The project enforces strict code style and quality rules using several tools defined in `composer.json`.
+
+#### Linting
+You can run all linting tools (PHPCS, PHPMD, PHPStan) using:
+```bash
+composer lint
+```
+Inside the PHP container, or from the host:
+```bash
+make lint
+```
+
+- **PHP CodeSniffer (PHPCS)**: Uses `PSR12` and `PSR2` along with customized PEAR and Squiz rules. Configuration: `phpcs.xml`.
+- **PHP Mess Detector (PHPMD)**: Configuration: `phpmd.xml`.
+- **PHPStan**: Static analysis tool. Configuration: `phpstan.neon`. Level 3 is currently enforced.
+
+#### Code Formatting
+To automatically fix many style violations:
+```bash
+composer lint-fix
+```
+(Inside the PHP container).
+
+### Additional Information
+- **Environment**: The `scripts/traefik.sh` script is used to manage a Traefik proxy for the project.
+- **Docker Compose**: The project uses multiple compose files: `docker-compose.yml` and `docker-compose-helpers.yml`. Always include both and the `.env` file when running commands manually from the host.