Add DZ60 keymap lint_kid (#9477)
* adding dz60 layout lint_kid
* adding dz60 layout lint_kid, removed readme
* removing wrong commented layout from dz60 lint_kid layout
* added readme
* Apply suggestions from code review
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Joel Challis <git@zvecr.com>