Adds basic support for u/flehrad's bigswitch pcb (#3015)

* Adds basic support for u/flehrad's bigswitch pcb

 - also adds support for OSX Eject/Power
   The function of this key depends on the version of OSX and if you
   have physical media. For a macbook pro 2017 holding this key down
   brings up the shutdown dialog. If you wrap it in LCTL and LSFT the
   screenlock turns on immediately.

* Switch to Layout Macro

 - add a code for OSX Sleep

* Add a README

* Turn on RGB by default

* Add info.json

* Address comments by @drashna

* Only define Eject in keymap

keyboards/bigswitch/keymaps/default/keymap.c

@@ -0,0 +1,27 @@
+/*
+Copyright 2018 QMK Contributors
+
+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
+#define KC_OSX_EJECT 0x66
+#define LOCK_OSX LSFT(LCTL(KC_OSX_EJECT))
+#define SLEEP_OSX LALT(LGUI(KC_OSX_EJECT))
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+LAYOUT(SLEEP_OSX),
+
+};