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: