Added contributing description

.gitee/ISSUE_TEMPLATE.en.md

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+**Is this a BUG REPORT or FEATURE REQUEST?**:
+
+> Uncomment only one, leave it on its own line: 
+>
+> - bug
+>
+> - feature
+
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Version:
+- OS (e.g. from /etc/os-release):
+- Kernel (e.g. `uname -a`):
+- Install tools:
+- Others:

.gitee/PULL_REQUEST_TEMPLATE.en.md

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+<!-- Thanks for sending a pull request! -->
+
+**What this PR does / why we need it**:
+
+**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
+
+**Special notes for your reviewer**:
+
+**Release note**:
+<!--  Steps to write your release note:
+1. Use the release-note-* labels to set the release note state (if you have access)
+2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`.
+-->
+```release-note
+```