Add PR template

.github/pull_request_template.md

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+Please follow this template, if applicable.
+
+## Description
+
+Provide a short description of the changes your PR introduces.
+This includes the actual feature you are adding,
+as well as any other relevant additions that where necessary to implement your feature.
+
+## Usage
+
+When adding a widget or anything else that affects the configuration,
+please provide a minimal example configuration snippet showcasing how to use it and
+
+### Showcase
+
+When adding widgets, please provide screenshots showcasing how your widget looks.
+This is not strictly required, but strongly appreciated.
+
+## Additional Notes
+
+Anything else you want to add, such as remaining questions or explainations.
+
+## Checklist
+
+Please make sure you can check all the boxes that apply to this PR.
+
+- [ ] All widgets I've added are correctly documented.
+- [ ] The documentation in the `docs/content/main` directory has been adjusted to reflect my changes.
+- [ ] I used `cargo fmt` to automatically format all code before committing