add pull request template

Author: cortze

.github/pull_request_template.md

@@ -0,0 +1,17 @@
+# Motivation
+<!-- Why are we developing this new code. Is the refactor needed, is the feature getting more data... -->
+
+
+_Related links:_
+- first link 
+
+# Description
+<!-- How are we approaching to solve the problem or deploy the new code -->
+<!-- What new structures will be added or what major changes will be applied -->
+
+# Tasks
+<!-- Checklist of tasks to do -->
+- [ ] first task 
+
+# Proof of Success 
+<!-- Here we may add any logs proving that we achieved what we expected or even diagrams that might be useful to understand the code -->