[Keymap] Initial commit of KL1RL keyboard layout (#7060)

* Inital commit

* Add changes suggest by fauxpark.  Tested for normal function

keyboards/redox/keymaps/KL1RL/readme.md

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+# A tweaked keymap for Redox
+
+I copied fculpo's layout and made a few modifcations more suited for my own needs. In general it seems to be a fairly straight foward adaptation
+of a standard QWERTY full size keyboard.  At least for me.
+
+![fculpo Layout Image](https://i.imgur.com/OXT8boJ.png)
+
+## Changes to the default keymap
+
+Keymap changes from the default keymap are:
+
+- Move `GUI` (`SUPER`) key to where default left `CTRL` is
+- Move `/?` into usual location next to right `SHIFT` - the default flash from Falbatech put `\|` here (might not be the Redox default?), which felt unintuitive
+- Put `\|` into bottom-left spot where `GUI` (`SUPER`) was - had to go somewhere and this bottom-left placement sort of balances with the almost bottom-right `/?`
+- Change default `ESC` into `ESC` on tap, `CTRL` on hold - for the love of the UNIX-ey `CTRL` key location and to keep `ESC` in the original position
+- Add `F11` and `F12` keys to two layers - needed on macOS if you want to control volume up and down from your keyboard (not shown, on a different layer)S
+- Access ADJUST layer by holding either `END` or `PAGEUP` off default layer.
+
+Changes by KL1RL are:
+- Remove the right hand `CTRL` combo key, it was bugging me.
+- Add Brightness Up and Brightness Down on the right hand thumb cluster on the ADJUST layer.
+- Add Mute, Vol Down and Vol Up on LH thumb cluster also on the ADJUST layer.