[kbd] [PATCH] keymaps: Add Irish keyboard map

[Cian Donovan]

Hi all,

I've added a basic Irish keyboard map, similar to the UK one but with
support for accented vowels and a few other minor differences.

Tested on multiple keyboards (laptop and standalone) with caps-lock
both on and off and everything seems to work fine.

Please let me know if there's anything that needs to be changed before
merging, this is my first FOSS contribution so I'm still getting to
grips with the process!