add: PR (Pull Request) 模板

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,29 @@
+<!-- 
+First of all, thank you for your contribution! 😄
+首先，感谢你的贡献！😄
+-->
+
+### 🤔 What is the nature of this change? / 这个变动的性质是？
+
+- [ ] New feature / 新特性提交
+- [ ] Fix bug / bug 修复
+- [ ] Style optimization / 样式优化
+- [ ] Code style optimization / 代码风格优化
+- [ ] Performance optimization / 性能优化
+- [ ] Build optimization / 构建优化
+- [ ] Website, documentation, demo improvements / 网站、文档、Demo 改进
+- [ ] Refactor code or style / 重构代码或样式
+- [ ] Test related / 测试相关
+- [ ] Other / 其他
+
+### 🔗 Related Issue / 相关 Issue
+
+(Describe the source of related requirements, such as the related issue discussion link. Example: close #123, close #456. /描述相关需求的来源，如相关的 issue 讨论链接。 例如：close #123, close #456. )
+
+### 💡 Background or solution / 需求背景和解决方案
+
+(The specific problem solved. / 解决的具体问题。)
+
+### 📝 Changelog / 更新日志
+
+(Describe changes from the user side, and list all potential break changes or other risks. / 从用户角度描述具体变化，以及可能的 breaking change 和其他风险。)