docs: add a custom shortcuts example

[nperez0111]

Changes Overview

This adds an example to the repo showing how to make a custom keyboard shortcut extension

Implementation Approach

Testing Done

Verification Steps

Additional Notes

Checklist

• I have created a changeset for this PR if necessary.
• My changes do not break the library.
• I have added tests where applicable.
• I have followed the project guidelines.
• I have fixed any lint issues.

Related Issues

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Latest commit: 28e459d

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commit: 28e459d