add PR template (#24509)

.github/PULL_REQUEST_TEMPLATE.md

+#### Required（必填, multiple choices, two at most）
+- **PR type（PR 类型） is ( ):**
+A. New features（新功能）---------------- D. Performance optimization（性能优化）
+B. Bug fixes（问题修复）------------------ E. Breaking changes（向后不兼容的改变）
+C. Function optimization（功能优化）------F.  Others（其它）
+
+- **PR changes（改动点）is ( ):**
+A. OPs（operators）---------------------- C. Docs（文档）
+B. APIs（接口）--------------------------- D. Others（其它）
+
+- **Use one sentence to describe what this PR does.（简述本次PR的目的和改动）**
+
+-----------------------
+#### Optional（选填, If None, please delete it）
+
+- **Describe what this PR does in detail. If this PR fixes an issue, please give the issue id.**
+  <!-- DESCRIBE THE BUG OR REQUIREMENT HERE. eg. #2020（格式为 #Issue编号）-->
+
+- **If you modified docs, please make sure that both Chinese and English docs were modified and provide a preview screenshot. （文档必填）**
+   <!-- ADD SCREENSHOT HERE IF APPLICABLE. -->
+
+- **Please write down other information you want to tell reviewers.**