docs(pr-template): add pull request template

.github/pull_request_template.md

@@ -0,0 +1,8 @@
+# Pull request
+
+This pull request closes issue: #XXX
+
+ - [ ] I have read and agreed to the [code of conduct](https://github.com/movie-web/movie-web/blob/dev/.github/CODE_OF_CONDUCT.md).
+ - [ ] I have read and complied with the [contributing guidelines](https://github.com/movie-web/movie-web/blob/dev/.github/CONTRIBUTING.md).
+ - [ ] What I'm implementing was assigned to me and is an [approved issue](https://github.com/movie-web/movie-web/issues?q=is%3Aopen+is%3Aissue+label%3Aapproved). For reference see our [GitHub projects](https://github.com/movie-web/movie-web/projects).
+ - [ ] I have tested all of my changes.