More QMK Configurator Warning/Error Fixes (#2720)
* Add readme with brief description
Change KEYMAP to LAYOUT
* Add readme.md with brief description
Use LAYOUT macro
* add a readme.md file
* Add readme.md with brief description
Use LAYOUT macro
* Add readme.md with brief description
Use LAYOUT macro
* Fix "Warning: contra: Missing layout pp macro for ['planck_mit', 'planck_grid']",
* Use LAYOUT macro