[Keymap] Adding garyjzhao's Iris keymap (#6980)

* Added Gary's user files

* Added Gary's Iris Keymap files

* Added Gary's Iris Keymap files

* updated readme

* removed comments

* Cleaned up code even more

users/gary/gary.h

@@ -0,0 +1,43 @@
+#include QMK_KEYBOARD_H
+
+#pragma once
+#define USE_SERIAL
+#define MASTER_LEFT
+
+// Layers
+// #define BASE 0 // Base layer
+// #define FCTN 4 // Function
+#define _QWERTY 0
+#define _LOWER 1
+#define _RAISE 2
+
+enum custom_keycodes {
+  QWERTY = SAFE_RANGE,
+  LOWER,
+  RAISE,
+};
+
+#define KC_RST RESET
+#define KC_ KC_TRNS
+
+#define KC_LOWR MO(_LOWER) // Lower layer
+#define KC_RASE MO(_RAISE) // Raise layer
+#define KC_CTLC C(KC_C)
+#define KC_CLTB C(KC_TAB)
+#define KC_OPASS G(KC_BSLS) // GUI + Back Slash
+#define KC_GARY LT(_RAISE, KC_SPC) // Hold for Raise, Tap for Space
+
+#define KC_SHOT SCMD(C(KC_4)) // Screenshot to Paste
+
+// Window Management
+#define KC_FULL A(G(KC_F))  // Full Screen
+#define KC_CNTR A(G(KC_C)) // Center
+#define KC_LHLF A(G(KC_LEFT)) // Left Half
+#define KC_RHLF A(G(KC_RGHT)) // Right Half
+
+#define KC_UPLF C(G(KC_LEFT)) // Upper Left
+#define KC_UPRG C(G(KC_RGHT)) // Upper Right
+#define KC_DNLF S(C(G(KC_LEFT))) // Lower Left
+#define KC_DNRG S(C(G(KC_RGHT))) // Lower Right
+
+#define KC_NEXT LCAG(KC_LEFT) // Move the Window to next display