[Keymap] add trwnh keymap for gmmk pro (#17267)

keyboards/gmmk/pro/rev1/ansi/keymaps/trwnh/readme.md

@@ -0,0 +1,91 @@
+### features
+
+- via enable
+- rgb matrix reactive and animation modes enabled
+- disable rgb when usb is suspended
+- mouse control
+	- fn+ralt+arrow keys to move
+	- fn+ralt+enter = left click
+	- fn+ralt+rshift = right click
+	- fn+ralt+rotary = scroll up/down (click for middle click)
+- fn+n = toggle n key rollover
+
+### changes
+
+- fn+space to reset (instead of fn+backslash)
+- fn+del = ins
+- fn+pgup = pause/break (brightness up on macos)
+- fn+pgdn = scroll lock (brightness down on macos)
+- fn+end = app menu
+- lower left mod key cluster = media controls
+	- fn+lctrl = prev
+	- fn+lsuper = play/pause
+	- fn+lalt = next
+	- fn+lshift = stop
+- function keys = 2nd row function keys
+	- fn+f1 = f13
+	- fn+f2 = f14
+	- ...
+	- fn+f12 = f24
+- fn + arrow keys used for nav
+	- fn + left = home
+	- fn + right = end
+	- fn + up = page up
+	- fn + down = page down
+- rgb control moved to qwer/asdf + z/x + t
+	- fn+q/a = hue increase/decrease
+	- fn+w/s = saturation increase/decrease
+	- fn+e/d = value increase/decrease
+	- fn+r/f = speed increase/decrease
+	- fn+z = rgb mode forward
+	- fn+x = rgb mode reverse
+	- fn+t = rgb toggle
+
+### rgb effects enabled
+
+sidebars are constant rainbow. alpha and capslock turn red when caps is on
+
+- solid color
+- rainbow gradient
+	- gradient up down
+	- gradient left right
+- breathing
+- rainbow cycles
+	- cycle all
+	- cycle left right
+	- cycle up down
+	- cycle out in
+	- cycle out in dual
+	- cycle pinwheel
+	- cycle spiral
+	- rainbow beacon
+	- rainbow pinwheels
+- reactive
+	- splash
+	- multisplash
+	- solid splash
+	- solid multisplash
+
+### layers
+
+source code for keyboard layout editor images here: https://gist.github.com/trwnh/94e48f132c49043373918df29409ab48
+
+#### layer 0
+
+![](https://i.imgur.com/P1hSkZT.png)
+
+#### layer 1
+
+![](https://i.imgur.com/qqiObxP.png)
+
+#### layer 2
+
+![](https://i.imgur.com/W0i1D0C.png)
+
+### misc
+
+i am taking suggestions for possible improvements to this keymap; you may contact me via the following
+
+- email: mailto:a@trwnh.com
+- chat: xmpp:a@trwnh.com
+- fediverse: https://mastodon.social/@trwnh