feat: add mr template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Issue
+
+<!-- #GitHubIssueNumber / Issue Link / Describe the problem here (if the issue hasn't been defined)  -->
+
+## What did you do?
+
+<!--
+- Describe what did you do in this code
+- Example:
+  - [CORRECT] Add auth feature / Modify auth feature.
+  - [WRONG] Create file /controllers/auth.ts, /models/user.ts, modify /routes/web.ts
+-->
+
+## Screenshot / Video
+
+<!--
+Attach pictures of this work / video explanation about this work
+-->
+
+## Note for Deployment
+
+<!--
+- Tell to DevOps what should he do to deploy this change
+- example:
+  - Please run migration when deploy this
+  - Please upload these files into folder xxx
+  - Please create folder `xxx` and give permission `777`
+  - Please run this SQL after deploy ```sql INSERT INTO xxx (...) ```
+  - etc...
+-->