add agreement calculation for human eval

[lwaekfjlk]

Closes #

📑 Description

✅ Checks

• [x] My pull request adheres to the code style of this project
• [x] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [x] All the tests have passed
• [x] Branch name follows type/descript (e.g. feature/add-llm-agents)
• [x] Ready for code review

ℹ Additional Information

[lwaekfjlk]

This file is originally proposed by Xuhui but I found that it is deleted from the latest branch.

[XuhuiZhou]

Hi @lwaekfjlk! Thanks for making the pull request, any chance you may add a readme doc and fix the mypy error?

[lwaekfjlk]

sure, will do later.

[lwaekfjlk]

Hi @XuhuiZhou , I fix the mypy error and update the readme file. Can you help merge this PR?