docs(contributing): add contributing.md

Author: fky2015

Diff for: contributing.md

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+# Contributing
+
+:tada:First off, thanks for taking the time to contribute!:tada:
+
+The following is a set of guidelines for contributing to BIThesis. 
+
+These are mostly guidelines, not rules. Use your best judgment, 
+and feel free to propose changes to this document in a pull request.
+
+## Guidence
+
+**[I don't want to read this whole thing, I just have a small question!!!](#join-our-slack-channel)**
+
+|                 | For User | For Developer |
+|-----------------|----------|---------------|
+| Have a Question | [Slack](#join-our-slack-channel)    | [Slack](#join-our-slack-channel)         |
+| Bug Report      | [Slack](#join-our-slack-channel)    | [Github - Issues](#bug-report-on-github)       |
+| Feature Request | [Slack](#join-our-slack-channel)    | [Slack](#join-our-slack-channel)         |
+| Pull Request    |          | [Github - Pull Request](#pull-request-process)        |
+
+## Join Our Slack Channel
+
+We provide an [offical Slack channel][slack channel invitation]
+with **a bunch of active maintainers** and **a friendly community**
+to give helpful advice **if you have any questions**.
+
+[![Join on Slack](/assets/slack.svg)](https://join.slack.com/t/bithesis/shared_invite/zt-epmzkyk0-fJRsUS36AlwMNB2AI_Q~Vw)
+
+- use `#community` channel to **report a bug**, **feature request** and **asking for help**.
+- use `#random` channel to have **unrelated discussion**:laughing:!
+- use `#annoucnment` channel if you don't want to miss the **updated news and features**!
+
+> note: there is no detailed rules about how to ask question, just provide enough information and 
+rethink before write.
+
+## Bug Report on Github
+
+If you can locate the bug or provide more detailed information, you may
+_[report an issue here][issue reporting link]_.
+
+
+## Pull Request Process
+
+Pull Request are welcomed!
+
+The following steps will help you finish a pull request.
+
+1. fork this repo.
+2. git clone your forked repo.
+3. make small changes until bug fixed.
+4. commit changes.
+5. create a pull request with related information.
+6. keep in touch with further disccusion and refine. 
+
+for more information, refer to the 
+_[Github Help](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests)_.
+
+[slack channel invitation]: https://join.slack.com/t/bithesis/shared_invite/zt-epmzkyk0-fJRsUS36AlwMNB2AI_Q~Vw
+[issue reporting link]: https://github.com/spencerwooo/BIThesis/issues/new
+