updated readme accordingly to the existing tasks.

[onurhuseyincantay]

🚀 Description

Current Readme doesn't expose the current situation of the repository.

📄 Motivation and Context

I had troubles to see what grade task I should be executing.

🧪 How Has This Been Tested?

It's purely based on IntelIJ Tasks and what I could get from there.

📦 Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

✅ Checklist

• [X] My code follows the code style of this project.
• [X] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.