Add a mocker library under the testing category

[zhongjie-cai]

Please check if what you want to add to awesome-go list meets quality standards before sending pull request. Thanks!

Please provide package links to:

• repo link (github.com, gitlab.com, etc): https://github.com/zhongjie-cai/gomocker
• pkg.go.dev: https://pkg.go.dev/github.com/zhongjie-cai/gomocker
• goreportcard.com: https://goreportcard.com/report/github.com/zhongjie-cai/mocker
• coverage service link (codecov, coveralls, etc.): https://github.com/zhongjie-cai/gomocker/actions/workflows/ci.yaml

Note: that new categories can be added only when there are 3 packages or more.

Make sure that you've checked the boxes below that apply before you submit PR.
Not every repository (project) will require every option, but most projects should. Check the Contribution Guidelines for details.

• The package has been added to the list in alphabetical order.
• The package has an appropriate description with correct grammar.
• As far as I know, the package has not been listed here before.
• The repo documentation has a pkg.go.dev link.
• The repo documentation has a coverage service link.
• The repo documentation has a goreportcard link.
• The repo has a version-numbered release and a go.mod file.
• I have read the Contribution Guidelines, Maintainers Note and Quality Standards.
• The repo has a continuous integration process that automatically runs tests that must pass before new pull requests are merged.
• Continuous integration is used to attempt to catch issues prior to releasing this package to end-users.

Thanks for your PR, you're awesome! 👍

[ChloeXZheng]

Hello, could I please be assigned to this pull request? Thank you!

[phanirithvij]

@ChloeXZheng I've assigned and unassigned you because I've realised this is already a PR (a pull request) and not an issue. So nothing you can do to contribute. If you want to add some project or work on improving site code etc. you need to create a new issue and then you can be assigned to work on it, then you can send a PR which will be reviewd by the project maintainers (for example me or avelino)
I suggest you read up on how git and github works.

[ChloeXZheng]

Oh okay, my bad, thank you for your time though