Update README.md by adding 'feature' and 'contributing' section

[jingyifu1225]

Hello, this is Jingyi.

This Pull Request enhances the READ.ME documentation by making the following improvements:

1. I added more detailed instructions for installing and building the project on various platforms, including additional guidance for Windows users. This should help users, especially those who are new to compiling C++ and Python projects, to get the project up and running more smoothly.
2. I introduced a dedicated "Features" section that highlights key capabilities of the AI.
3. A more comprehensive contributing guide has been added to help new contributors navigate the process of forking, cloning, and submitting pull requests.

I believe these changes will make the project more accessible to new users and contributors. I'm excited about this project and look forward to seeing it continue to grow and improve!