Fix: Add Instructions for Storing GitHub Token in GitHub Actions Secrets

[busycaesar]

Problem

The README initially did not instruct users to store their GitHub Token in GitHub Actions secrets. As a result, GitHub Actions did not have the required permissions to push the converted images back to the repository.

Error

When running the workflow, the following error was encountered:

Fixes & Improvements

• Added instructions to the README, guiding users to store their GitHub Token in GitHub Actions secrets.
• Provided relevant documentation links to help users generate and store their GitHub Token.
• Updated the YAML workflow file to ensure that the GitHub Token is used when checking out the repository, allowing the workflow to push changes successfully.

This update ensures that the workflow runs smoothly without permission issues.

Follow is how the updated yml script looks like and works successfully.