Create pull_request_template.md (#115)

Establishing a pull request template

.github/pull_request_template.md

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+## Description
+
+<!--
+Describe your changes here:
+
+- What's the problem solved (briefly, since the issue is where this is elaborated in more detail).
+- Introduce your implementation approach in a way that helps reviewing it well.
+-->
+
+## Resolved issues
+
+<!--
+Note the Jira and GitHub issue(s) resolved by this PR (`Fixes|Resolves ...`).
+Make sure that the linked issue titles & descriptions are also up to date.
+-->
+
+## Documentation
+
+<!--
+Please make sure that...
+- Documentation impacted by the changes is up to date (becomes so, remains so).
+  - Public documentation is in the repository in the docs/ folder.
+  - If there impacts on Canonical processes the relevant documentation should be update outside the repository, confirm that this has happened.
+- Tests are included for the changed functionality in this PR. If to be merged without tests, please elaborate why.
+-->
+
+## Tests
+
+<!--
+- How was this PR tested? Please provide steps to follow so that the reviewer(s) can test on their end.
+- Please provide a list of what tests were run.
+-->