Add issue & PR template

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: "\U0001F41B Bug Report"
+about: Submit a bug report to help us improve CogDL
+
+---
+
+## 🐛 Bug
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1.
+1.
+1.
+
+<!-- If you have a code sample, error messages, stack traces, please provide it here as well -->
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Environment
+
+ - CogDL version:
+ - OS (e.g., Linux):
+ - Python version:
+ - PyTorch version:
+ - PyG version (if installed):
+ - DGL version (if installed):
+ - CUDA/cuDNN version (if applicable):
+ - Any other relevant information:
+
+## Additional context
+
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/documentation.md

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+---
+name: "\U0001F4DA Documentation"
+about: Report an issue related to cogdl.readthedocs.io
+
+---
+
+## 📚 Documentation
+
+<!-- Please specify whether it's tutorial part or API reference part-->
+<!-- Describe the issue.-->

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: "\U0001F680 Feature Request"
+about: Submit a proposal/request for a new CogDL feature
+---
+
+## 🚀 Feature
+
+<!-- A clear and concise description of the feature proposal. Please provide a link to the paper and code in case they exist. -->
+
+## Motivation
+
+<!-- Please outline the motivation for the proposal. Is your feature request related to a problem? e.g., I'm always frustrated when [...]. If this is related to another GitHub issue, please link here too. -->
+
+## Additional context
+
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/installation.md

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+---
+name: "\U0001F4DA Installation"
+about: Report an installation problem with CogDL
+---
+
+## 📚 Installation
+
+<!-- A clear and concise description of the installation error. If you have installation log file, please provide it here as well. -->
+
+## Environment
+
+* OS:
+* Python version:
+* PyTorch version:
+* CUDA/cuDNN version:
+* How did you try to install CogDL (wheel, source):
+* Any other relevant information:
+
+## Checklist
+
+- [ ] I followed the [installation guide](https://github.com/thudm/cogdl#requirements-and-installation).
+- [ ] I set up CUDA correctly.
+- [ ] I do have multiple CUDA versions on my machine.
+
+## Additional context
+
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/question-help.md

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+---
+name: "❓Questions & Help"
+about: Start a general discussion related to CogDL
+---
+
+## ❓ Questions & Help
+
+<!-- A clear and concise description of the question. -->

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Brief description. Refer to the related issues if existed.-->
+
+## Checklist
+Please feel free to remove inapplicable items for your PR.
+- [ ] The PR title starts with [$CATEGORY] (such as [Model], [Doc], [Feature], [Bugfix])
+- [ ] Changes are complete (i.e. I finished coding on this PR)
+- [ ] All changes have test coverage
+- [ ] Code is well-documented
+- [ ] To my best knowledge, examples are either not affected by this change,
+      or have been fixed to be compatible with this change
+- [ ] Related issue is referred in this PR