feature: modify pull_request_template.md (#8)

- description
- add some checkboxes
- merging strategy

Author: thispath98

.github/pull_request_template.md

@@ -1,16 +1,26 @@
-## PR Checklist
+# What does this PR do?
+<!-- 
+Once merged, your PR is going to appear in the release notes with the title you set, so make sure it's a great title that fully reflects the extent of your awesome contribution.
 
+Then, please replace this with a description of the change and which issue is fixed (if applicable). Please also include relevant motivation and context. List any dependencies (if any) that are required for this change.
+-->
+
+Fixes # (issue)
+
+## Before submitting
+- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
+- [ ] 커밋 컨벤션을 확인하셨나요?
 - **Tag**: Select the appropriate tag for this PR:
   - [ ] `feature`
   - [ ] `fix`
   - [ ] `refactor`
   - [ ] `test`
-
 - **Module**: Select the relevant module(s) affected by this PR:
   - [ ] `sql`
   - [ ] `rag`
   - [ ] `base`
   - [ ] `deploy`
 
-## Description
-- 
+## How to merge?
+- [ ] `dev` branch에서 `main` branch로 merge할 경우 **Squash and merge**를 선택해야 합니다.
+- [ ] feature branch에서 `dev` branch로 merge할 경우 **Rebase and merge**를 선택해야 합니다.