chore: create pull request template (#126)

.github/pull_request_template.md

@@ -0,0 +1,52 @@
+<!--
+Before opening your pull request, have a quick look at our contribution guidelines:
+https://github.com/TuGraph-family/OSGraph/blob/master/community/CONTRIBUTING.md
+-->
+
+## Title
+<!--
+And make sure that the title of your pull request follows the following format:
+`<type>(<scope>): <subject>`
+
+`<type>` is the type of your pull request.
+`<scope>` is optional (including `()`) when you choose `none`.
+`<subject>` is a concise sentence in lowercase.
+-->
+
+**Type**
+<!-- What is the type of your pull request? Open the item by `[x]` way. -->
+
+- [ ] `feat`: (new feature)
+- [ ] `fix`: (bug fix)
+- [ ] `docs`: (doc update)
+- [ ] `style`: (update format)
+- [ ] `refactor`: (refactor code)
+- [ ] `test`: (test code)
+- [ ] `chore`: (other updates)
+
+**Scope**
+<!-- Which module does your pull request mainly modify? Select `none` when undetermined. -->
+
+- [ ] `web`: (web front-end module)
+- [ ] `api`: (web api module)
+- [ ] `service`: (service module)
+- [ ] `data`: (graph data module)
+- [ ] `search`: (search module)
+- [ ] `none`: (no module)
+
+### Description
+<!-- Provide the relevant issue number associated with your pull request if needed. -->
+
+**Issue:** #
+
+<!-- Provide more information about this pull request. -->
+
+### Checklist
+
+- [ ] I have prepared the pull request title according to the requirements.
+- [ ] I have successfully run all unit tests and integration tests.
+- [ ] I have followed the code style guidelines of this project.
+- [ ] I have already rebased the latest `master` branch.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have made corresponding changes to the documentation.
+