Fix typo in requirements file name

[E0SelmY4V]

Pull request checklist

• [x] The PR has a proper title. Use Semantic Commit Messages. (No more branch-name title please)

• [x] Make sure this is ready to be merged into the relevant branch. Please don't create a PR and let it hang for a few days.

• [x] Ensure you can run the codes you submitted succesfully. These submissions will be prioritized for review:

  Introduce improvements in program execution speed;

  Introduce improvements in synthesis quality;

  Fix existing bugs reported by user feedback (or you met);

  Introduce more convenient user operations.

PR type

• Bug fix

Description

• Change requirments to requirements in the README.
• Make it easier for beginners to install (No, poetry is bad, and I can't use it to install).