Create CONTRIBUTING.md

Author: shenxianpeng

CONTRIBUTING.md

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+# Contributing
+
+Thank you for investing your time in contributing to this project! ✨.
+
+## Make Changes
+
+When you're finished with the changes, create a pull request, also known as a PR.
+
+* Please helps reviewers understand the purpose of your pull request.
+* Don't forget to link PR to issue if you are solving one.
+* If you run into any merge issues, please resolve merge conflicts and other issues.
+
+## Development
+
+### Build
+
+Install `clang-tools` from source code
+
+```bash
+git clone git@github.com:shenxianpeng/clang-tools-pip.git
+# Need root permission
+sudo python3 setup.py install
+# Install clang-tools version 13
+sudo python3 main.py --install true --version 13
+```
+
+### Test
+
+```bash
+cd tests
+# run test
+pytest
+# run test with code covarege
+coverage run -m pytest
+```