Add PR template

.github/pull_request_template.md

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+<!--
+  This template is optional.
+  It simply serves to provide a guide to allow a better review of pull requests.
+-->
+
+<!--
+  IMPORTANT
+  Don't forget to add the corresponding "changelog:xxx" label to your PR.
+  This is part of our release process in order to generate the change log.
+-->
+
+
+## What does this PR do ?
+<!-- Please fill this section -->
+
+<!--
+  Please include a summary of the change and which issue is fixed.
+  Please also include relevant motivation and context.
+  List any dependencies that are required for this change.
+-->
+
+### How should this be manually tested?
+
+<!--
+  Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.
+  Please also list any relevant details for your test configuration
+-->
+  - Step 1 :
+  - Step 2 :
+  - Step 3 :  
+  ...
+
+### Other changes
+
+<!--
+  Please describe here all changes not directly linked to the main issue, but made because of it.
+  For instance: issues spotted during this PR and fixed on-the-fly, dependencies update, and so on
+-->
+
+### Boyscout
+
+<!--
+  Describe here minor improvements in the code base and not directly linked to the main changes:
+  typos fixes, better/new comments, small code simplification, new debug messages, and so on.
+-->