Create PULL_REQUEST_TEMPLATE.md

Author: 梶塚太智

.github/PULL_REQUEST_TEMPLATE.md

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+## Pull Request
+
+### Description
+Provide a brief summary of the changes introduced by this pull request.
+
+### Related Issue
+If this pull request is related to any GitHub issue, provide a link to the issue here.
+
+### Changes
+List the high-level changes introduced by this pull request.
+
+### Screenshots
+If applicable, include screenshots or GIFs that demonstrate the changes visually.
+
+### Testing
+Describe the testing steps you've taken to ensure the changes work as intended.
+
+### Checklist
+Mark the items that apply to this pull request using "x".
+
+- [ ] I have tested these changes thoroughly.
+- [ ] This pull request is related to an existing issue.
+- [ ] I have added necessary documentation.
+- [ ] All tests pass successfully.
+
+### Additional Notes
+Add any additional information or context that might be helpful for the reviewer.