Add a Pull Request template (#5764)

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,12 @@
+<!--
+  Please include a summary of the change and which issue is fixed.
+  Also make sure you've tested your code and also done a self-review of it.
+  Don't forget to check all base themes and tablet mode for relevant changes.
+  
+  If your changes are visual, please provide images below:
+
+### Images
+| Image 1 | Image 2 |
+| ------- | ------- |
+| ![](https://github.githubassets.com/images/modules/logos_page/Octocat.png) | ![](https://github.githubassets.com/images/modules/logos_page/Octocat.png) |
+-->