add issue and pr template

.github/ISSUE_TEMPLATE/Ask_Question.md

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+---
+name: Ask Question
+about: Ask a question about usage or feature
+
+---
+
+### Your question
+
+describe your question clearly
+
+### Your scenes
+
+describe your use scenes (why need this feature)
+
+### Your advice
+
+describe the advice or solution you'd like
+
+### Environment
+
+- SOFARPC version:
+- JVM version (e.g. `java -version`):
+- OS version (e.g. `uname -a`):
+- Maven version:
+- IDE version:
+
+

.github/ISSUE_TEMPLATE/Bug_Report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+
+---
+
+### Describe the bug
+
+A clear and concise description of what the bug is.
+
+### Expected behavior
+
+### Actual behavior
+
+### Steps to reproduce
+
+### Minimal yet complete reproducer code (or GitHub URL to code)
+
+### Environment
+
+- SOFARPC version:
+- JVM version (e.g. `java -version`):
+- OS version (e.g. `uname -a`):
+- Maven version:
+- IDE version:

.github/PULL_REQUEST_TEMPLATE.md

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+### Motivation:
+
+Explain the context, and why you're making that change.
+To make others understand what is the problem you're trying to solve.
+
+### Modification:
+
+Describe the idea and modifications you've done.
+
+### Result:
+
+Fixes #<GitHub issue number>. 
+
+If there is no issue then describe the changes introduced by this PR.