Create PULL_REQUEST_TEMPLATE.md

Author: hummelstrand

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Before you open a PR, be sure to read our Contribution guidelines:
+https://nrkno.github.io/sofie-core/docs/for-developers/contribution-guidelines
+-->
+
+## About the Contributor
+<!--
+Tell us who / which organization you are representing, and how the Sofie team will be able to contact you.
+Example: "This pull request is posted on behalf of the NRK."
+-->
+
+
+## Type of Contribution
+
+This is a: 
+<!-- (pick one) -->
+Bug fix / Feature / Code improvement / Documentation improvement / Other (please specify)
+
+
+## Current Behavior
+<!--
+Please describe how things worked before this PR.
+If it's a bug fixe: Describe the bug (what was happening?)
+-->
+
+
+## New Behavior
+<!--
+What is the new behavior?
+-->
+
+
+## Testing Instructions
+<!--
+Please provide some instructions and other information for how to verify that the feature works.
+Examples:
+* "Do a Take for a part that contains an adlib, verify that the adlib plays out."
+* "Open the Switchboard panel and toggle a route, verify that the route toggles in the GUI."
+* "This feature also affects 'feature X', so that needs to be tested for regressions as well."
+-->
+
+
+## Other Information
+<!-- The more information you can provide, the easier the pull request will be to merge -->
+
+
+## Status
+<!--
+Before you open the PR, make sure the items below are done.
+If they're not, please open the PR as a Draft.
+-->
+
+- [ ] PR is ready to be reviewed.
+- [ ] The functionality has been tested by the author.
+- [ ] Relevant unit tests has been added / updated.
+- [ ] Relevant documentation (code comments, [system documentation](https://nrkno.github.io/sofie-core/)) has been added / updated.