Create pull_request_template.md

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Description of the changes
+
+
+### Affected components
+
+
+### Related issues
+Link here any Pull Request, issue, confluence page or Asana task related to this Pull Request?
+
+
+## Checklist
+- [ ] Successful build and test (Github build)
+- [ ] Successful continuous integration (Jenkins)
+- [ ] The modified code has been properly formated
+
+
+## How can this changes be validated?
+Write a step by step guide of what should be done to validate these changes:
+
+
+### Other things to have in mind
+- Are there any critical components affected?
+- Have you encountered any edge cases?
+- Do these changes have a due date?
+