docs: add badge & Github button & issue template (#208)

* add badge & add Github button

* add issue template

* reformat with black

* fix issue template error

* add edit on github button

* fix issue template

* change conf.py

* Update .github/ISSUE_TEMPLATE/bug-report.md

---------

Co-authored-by: you-n-g <you-n-g@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,38 @@
+---
+name: "\U0001F41B Bug Report"
+about: Submit a bug report to help us improve RD-Agent
+labels: bug
+
+---
+
+## 🐛 Bug Description
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1.
+2.
+3.
+
+
+## Expected Behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Screenshot
+
+<!-- A screenshot of the error message or anything shouldn't appear-->
+
+## Environment
+<!-- TODO: We may provide a more automatic way to get the information -->
+ - RD-Agent version:
+ - Python version:
+ - OS: Linux
+ - Commit number (optional, please provide it if you are using the dev version):
+
+## Additional Notes
+
+<!-- Add any other information about the problem here. -->

.github/ISSUE_TEMPLATE/documentation.md

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+---
+name: "\U0001F4D6 Documentation"
+about: Report an issue related to documentation
+
+---
+
+## 📖 Documentation
+
+<!-- Please specify whether it's tutorial part or API reference part, and describe it.-->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,25 @@
+---
+name: "\U0001F31FFeature Request"
+about: Request for a new RD-Agent feature
+labels: enhancement
+
+---
+
+## 🌟 Feature Description
+<!-- A clear and concise description of the feature proposal -->
+
+## Motivation
+
+1. Application scenario
+2. Related works (Papers, Github repos etc.):
+3. Any other relevant and important information:
+
+<!-- Please describe why the feature is important. -->
+
+## Alternatives
+
+<!-- A short description of any alternative solutions or features you've considered. -->
+
+## Additional Notes
+
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,10 @@
+---
+name: "❓Questions & Help"
+about: Have some questions? We can offer help.
+labels: question
+
+---
+
+## ❓ Questions and Help
+
+We sincerely suggest you to carefully read the [documentation](http://rdagent.readthedocs.io/). After that, if you still feel puzzled, please describe the question clearly under this issue.