Add link to video tutorial demonstrating how to write a rule #4910
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I finally took the time to create a video that walks through the creation of a new rule.
It covers a number of concepts that are useful to know when contributing to SwiftLint.
Video is here: https://vimeo.com/819268038
If there are other tips and tricks that you've found useful when working on SwiftLint, please let me know and maybe I'll record a new video once this one becomes out of date.