[Keyboard] Add handwired split tester (#5413)
* Add handwired split tester
* Update keyboards/handwired/splittest/readme.md
Co-Authored-By: nooges <nooges@users.noreply.github.com>
* Update keyboards/handwired/splittest/readme.md
Co-Authored-By: nooges <nooges@users.noreply.github.com>
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