Added GMMK Pro keymap with RGB

keyboards/gmmk/pro/ansi/keymaps/benschaeff/README.md

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+Description  
+Pretty simple keymap with a few handy tools on a 2nd layer and rotary encoder.  
+
+Encoder  
+Holding tab and scrolling encoder will allow scrolling through applications, as if using alt + tab  
+Holding ctrl and scrolling encoder will allow scrolling through chrome tabs  
+FN + Encoder scroll is media next/prev  
+FN + Encoder press is media pause  
+default encoder behavior is volume up/down  
+
+Function Layer  
+FN + \ is used to put keyboard into bootloader mode  
+FN + ESC is the same as alt F4, for closing applications  
+FN + F1 is to close current browser tab  
+FN + Q moves current application one monitor to the left  
+FN + W maximizes current application  
+FN + E moves current application one monitor to the right  
+FN + S minimizes current application  
+FN + F is used in junction with the "Popout tab" extension to chrome (https://chrome.google.com/webstore/detail/popout-tab/pcfcieidiaaobigemjnkclebhnmgfbco) to pop out current tab to its own window

keyboards/gmmk/pro/ansi/keymaps/benschaeff/keymap.c

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+/* Copyright 2021 Glorious, LLC <[email protected]>
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include QMK_KEYBOARD_H
+
+enum userspace_layers {
+  QWERTY,
+	FNLAYER,
+	POPTAB,
+};
+
+//custom keycodes
+#define MODS_ALT_MASK (MOD_BIT(KC_LALT)) // Make ALT layer for encoder use 
+#define MODS_CTRL_MASK (MOD_BIT(KC_LCTL)) // Make CTRL layer for encoder use
+#define SWAP_L SGUI(KC_LEFT) // Swap application to left display
+#define SWAP_R SGUI(KC_RGHT) // Swap application to right display
+#define MINI LGUI(KC_DOWN) // Shrink window
+#define MAXI LGUI(KC_UP) // Maximize window
+#define CLOSEAPPLICATION LALT(KC_F4) // Kill application
+#define CLOSETAB LCTL(KC_W) // Kill current tab
+#define POPOUT LCTL(LSFT(KC_K))
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+//      ESC      F1       F2       F3       F4       F5       F6       F7       F8       F9       F10      F11      F12	     Prt           Rotary(Mute)
+//      ~        1        2        3        4        5        6        7        8        9        0         -       (=)	     BackSpc           Del
+//      Tab      Q        W        E        R        T        Y        U        I        O        P        [        ]        \                 PgUp
+//      Caps     A        S        D        F        G        H        J        K        L        ;        "                 Enter             PgDn
+//      Sh_L              Z        X        C        V        B        N        M        ,        .        ?                 Sh_R     Up       End
+//      Ct_L     Win_L    Alt_L                               SPACE                               Alt_R    FN       Ct_R     Left     Down     Right
+
+
+    // The FN key by default maps to a momentary toggle to layer 1 to provide access to the RESET key (to put the board into bootloader mode). Without
+    // this mapping, you have to open the case to hit the button on the bottom of the PCB (near the USB cable attachment) while plugging in the USB
+    // cable to get the board into bootloader mode - definitely not fun when you're working on your QMK builds. Remove this and put it back to KC_RGUI
+    // if that's your preference.
+    //
+    // To put the keyboard in bootloader mode, use FN+backslash. If you accidentally put it into bootloader, you can just unplug the USB cable and
+    // it'll be back to normal when you plug it back in.
+
+    [QWERTY] = LAYOUT(
+        KC_ESC,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_PSCR,          KC_MUTE,
+        KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC,          KC_DEL,
+        KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,          KC_PGUP,
+        KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,           KC_PGDN,
+        KC_LSFT,          KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT, KC_UP,   KC_END,
+        KC_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             KC_RALT, MO(FNLAYER),   KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+
+    [FNLAYER] = LAYOUT(
+        CLOSEAPPLICATION, CLOSETAB,_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_MEDIA_PLAY_PAUSE,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+        _______, SWAP_L ,  MAXI  , SWAP_R , _______, _______, _______, _______, _______, _______, _______, _______, _______, RESET  ,          _______,
+        _______, _______,  MINI  , _______, POPOUT,  _______, _______, _______, _______, _______, _______, _______,          _______,          _______,
+        _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______,
+        _______, _______, _______,                            _______,                            _______, _______, KC_TRNS, _______, _______, _______
+    ),
+
+
+};
+
+
+bool encoder_update_user(uint8_t index, bool clockwise) {
+    if (get_mods() & MODS_ALT_MASK) {
+        if (clockwise) {
+            tap_code(KC_TAB);
+        } else {
+            tap_code16(S(KC_TAB));
+        }
+    } else if (get_mods() & MODS_CTRL_MASK) {
+        if (clockwise) {
+            tap_code(KC_TAB);
+        } else {
+            tap_code16(S(KC_TAB));
+        }
+    } else if(IS_LAYER_ON(FNLAYER)) {
+        if (clockwise) {
+            tap_code(KC_MEDIA_NEXT_TRACK);
+        } else {
+            tap_code(KC_MEDIA_PREV_TRACK);
+        }
+    } else {
+        if (clockwise) {
+            tap_code(KC_VOLU);
+        } else {
+            tap_code(KC_VOLD);
+        }
+    }
+    return false;
+}
+
+void rgb_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {
+    switch(get_highest_layer(layer_state)) {
+    // special handling per layer
+        case 0:  //layer one
+            if (host_keyboard_led_state().caps_lock)     
+                rgb_matrix_set_color_all(255,0,0);
+            else
+                rgb_matrix_set_color_all(0,255,56);
+            break;
+        case 1:
+            for (uint8_t i = led_min; i < led_max; i++) {
+                 RGB_MATRIX_INDICATOR_SET_COLOR(i,0,0,0);
+            }
+            RGB_MATRIX_INDICATOR_SET_COLOR(0, 0, 0, 255) //esc
+            RGB_MATRIX_INDICATOR_SET_COLOR(6, 0, 0, 255) //f1
+            RGB_MATRIX_INDICATOR_SET_COLOR(8, 0, 0, 255) //q
+            RGB_MATRIX_INDICATOR_SET_COLOR(14, 0, 0, 255) //w
+            RGB_MATRIX_INDICATOR_SET_COLOR(20, 0, 0, 255) //e
+            RGB_MATRIX_INDICATOR_SET_COLOR(15, 0, 0, 255) //s
+            RGB_MATRIX_INDICATOR_SET_COLOR(26, 0, 0, 255) //f
+            RGB_MATRIX_INDICATOR_SET_COLOR(49, 0, 0, 255) //R_Alt
+            break;
+        default:
+            break;
+    }
+}