Create pull_request_template.md

Author: ramirezdiego

docs/pull_request_template.md

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+Before you submit this PR: make sure to put all operations-related information in a wiki-note, a PR should be about code and is publicly accessible
+
+**What is the problem / what does the code in this PR do**
+
+**Can you give a minimal working example (or illustrate with a figure)?**
+
+Please include the following if applicable:
+  - Update the documentation/README
+  - Tests to check the (new) code is working as desired.
+  - Does it solve one of the open issues on github?
+
+Please make sure that all automated tests have passed before asking for a review (you can save the PR as a draft otherwise).