FancyZones and Shortcut Guide initial commit

Co-authored-by: Alexis Campailla <alexis@janeasystems.com>
Co-authored-by: Bret Anderson <bretan@microsoft.com>
Co-authored-by: Enrico Giordani <enrico.giordani@gmail.com>
Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>
Co-authored-by: Jeff Bogdan <jeffbog@microsoft.com>
Co-authored-by: March Rogers <marchr@microsoft.com>
Co-authored-by: Mike Harsh <mharsh@microsoft.com>
Co-authored-by: Nachum Bundak <Nachum.Bundak@microsoft.com>
Co-authored-by: Oliver Jones <ojones@microsoft.com>
Co-authored-by: Patrick Little <plittle@microsoft.com>

.github/pull_request_template.md

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+<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
+## Summary of the Pull Request
+
+<!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> 
+## References
+
+<!-- Please review the items on the PR checklist before submitting-->
+## PR Checklist
+* [ ] Closes #xxx
+* [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/PowerToys) and sign the CLA
+* [ ] Tests added/passed
+* [ ] Requires documentation to be updated
+* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
+
+<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
+## Detailed Description of the Pull Request / Additional comments
+
+<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
+## Validation Steps Performed