Add PR creation rules and template for consistency in submissions

Author: xterao

.claude/commands/create_pr.md

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+# PR Creation Rules
+This document describes the format and rules for creating a Pull Request (PR) on GitHub.
+
+# Execution Details
+
+## Command to Execute
+
+To create a PR, execute the following command. Add options as needed to construct the title, body, etc.
+```bash
+gh pr create
+```
+
+The rules for describing the content of the PR are as follows.
+## Title
+Follow these rules for the PR title:
+- Write the title in English.
+- Keep the title concise and clearly indicate the changes.
+
+## Body
+Follow these rules for the PR body:
+- Write the body in English.
+- It is recommended to divide the body into the following sections:
+  - Refer to the [PR Template](../templates/PR_TEMPLATE.md) for the PR body template.
+- Briefly explain the purpose and impact of the changes.
+- Include related issue numbers or ticket numbers, if possible.
+
+## Labels
+Labels are automatically assigned by GitHub Actions, so no manual configuration is required.

.claude/templates/PR_TEMPLATE.md

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+**Description**
+
+---
+**Related Issue**
+
+---
+**Type of Change**
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Other (please specify)
+- [ ] Refactor
+- [ ] Test
+- [ ] Build system change
+- [ ] Chore
+- [ ] Performance improvement
+- [ ] Code style update
+- [ ] Security fix
+- [ ] Other (please specify)
+
+---