docs: add template for adding issue and pr (openyurtio#160)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: kind/bug
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- OpenYurt version:
+- Kubernetes version (use `kubectl version`):
+- OS (e.g: `cat /etc/os-release`):
+- Kernel (e.g. `uname -a`):
+- Install tools:
+- Others:

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+title: "[feature request]"
+labels: kind/feature-request
+
+---
+
+<!-- Please only use this template for submitting feature requests -->
+
+**What would you like to be added**:
+
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Question about OpenYurt.
+title: "[Question]"
+labels: kind/question
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- OpenYurt version:
+- Kubernetes version (use `kubectl version`):
+- OS (e.g: `cat /etc/os-release`):
+- Kernel (e.g. `uname -a`):
+- Install tools:
+- Others:

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- 
+Please make sure you have read and understood the contributing guidelines;
+https://github.com/alibaba/openyurt/blob/master/CONTRIBUTING.md -->
+
+### Ⅰ. Describe what this PR does
+
+
+### Ⅱ. Does this pull request fix one issue?
+<!--If so, add "fixes #xxxx" below in the next line, for example, fixes #15. Otherwise, add "NONE" -->
+
+
+### Ⅲ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.
+
+
+### Ⅳ. Describe how to verify it
+
+
+### Ⅴ. Special notes for reviews
+
+