feature: flappy bird game added

[praptisharma28]

🛠️ Fixes Issue: #41

Type of change ✍️

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)

👨‍💻 Changes proposed:

This pull request adds a Python implementation of the classic game Flappy Bird using the Pygame library. It includes the game code, as well as a comprehensive documentation detailing how to play the game, its objective, controls, and other relevant information.

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.
• [x] I have included comments in areas that may be difficult to understand.
• [x] My changes have not introduced any new warnings.
• [x] I have conducted a self-review of my code.
• [ ] I am a participant of SWOC'24.

📷 Screenshots

📄 Note to reviewers

[praptisharma28]

@pinak22dhir added , hv a look!