github: add pull request template to inform commit rules

Signed-off-by: Zhouqi Jiang <luojia@hust.edu.cn>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,7 @@
+<details>
+<summary>📝 <strong>Click for commit rules checklist / 点击查看提交规范检查表</strong></summary>
+
+- [![Commit Rules (EN)](https://img.shields.io/badge/Commit%20Rules-Important!-brightgreen?style=flat&logo=git)](https://github.com/rustsbi/slides/blob/main/2025/reports/Contributing%20to%20RustSBI.md)
+- [![Commit Rules (ZH)](https://img.shields.io/badge/查看提交规范-重要!-brightgreen?style=flat&logo=git)](https://github.com/rustsbi/slides/blob/main/2025/reports/%E4%B8%BA%20RustSBI%20%E8%B4%A1%E7%8C%AE.md)
+
+</details>