[Keymap] Updates to personal keymaps (#8818)

* sync with upstream; initial iris design

* sync with upstream

* update to iris keymap

* merge upstream

* iris keymap refined

* Iris readme update

* messed up upstream merge somehow, hopefully fixed

* removed extra closing bracket

* Apply suggestions from code review

Co-Authored-By: Joel Challis <git@zvecr.com>

* change layers from define to enum per suggestions

Co-authored-by: Mysti Woodard <mystiwoodard@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>

keyboards/keebio/iris/keymaps/khitsule/readme.md

@@ -0,0 +1,31 @@
+# Iris Layout by Khitsule
+
+![Khitsule](https://i.imgur.com/BIzu3RZ.png)
+
+[KLE link](http://www.keyboard-layout-editor.com/#/gists/856ad949a89c47fa84c808ba17ae10c5)
+
+## Layers
+
+| Layer | Legend |
+| ----- | ------ |
+| Base  |  Centre (black) |
+| Game  |  Centre (black) - see below |
+| Lower | Bottom (purple) |
+| Raise | Top (pink) |
+
+## Features
+
+* Raise/lower layers focus first on one-handed use
+* Numpad on right hand with raise layer
+* Game layer to be used as a gamepad
+  * Accessed by gui key in raise layer, return with the raise key
+  * Same as base layer **except** numbers 1-5 replaced with F1-F5; dual function removed from thumb keys (dedicated lower and space)
+  * Numbers to F1-F5 is designed to be used with a mouse such as the Naga that has numbers
+  * Lower layer gives one-handed access to arrows and F6-F10 as well
+* Navigation on left hand with lower layer
+  * D refers to desktop left/right on Win 10 (win+ctrl+left/right)
+* Use of hold/tap dual function keys
+  * Ctrl/Space
+  * Shift/Backspace
+  * Lower/Tab
+* Dedicated ctrl and shift to allow for navigation shortcuts with ctrl+shift+nav