chore: add pr template

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Before creating this pull request, check the questions below: -->  
+<!-- 在提出这个 pull request 之前，请勾选下面的问题： -->
+
+- [ ] 您的代码是否能够编译通过？
+- [ ] 您是否检查了目前在 [pull requests](https://github.com/eesast/THUAI5/pulls) 中是否有与你的贡献功能相同的更改？
+- [ ] 您的贡献是否符合[贡献者代码协议](https://github.com/eesast/THUAI5/blob/dev/CODE_OF_CONDUCT.md)？
+- [ ] 您的贡献是否符合[开发规则](https://github.com/eesast/THUAI5#%E5%BC%80%E5%8F%91%E8%A7%84%E5%88%99)？  
+
+Discriptions of this pull request:
+
+<!-- If you have something to say about this pull request, delete the sentence 'No additional discription.' below and add your description. -->
+<!-- 如果你对这次的 pull request 有一些描述，请删除下面的句子“No additional discription.”并加上你的描述。 -->
+
+No additional discription.