[Keyboard] Added bradpad support (#12912)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/tempo_turtle/bradpad/keymaps/midi_demo/keymap.c

@@ -0,0 +1,42 @@
+/*
+Copyright 2021 v3ritas <v3ritas@tempoturtle.com>
+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 layers {
+    _NATURAL,
+    _SHARP,
+    _FLAT
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [_NATURAL] = LAYOUT(
+        MI_C, MI_BENDD, MI_BENDU, MI_G,
+        MI_D, MI_VELD,  MI_VELU,  MI_A,
+        MI_E, MI_TRNSD, MI_TRNSU, MI_B,
+        MI_F, MI_OCTD,  MI_OCTU,  MI_C,
+             MO(_SHARP), MO(_FLAT)),
+    [_SHARP] = LAYOUT(
+        MI_Cs, KC_TRNS, KC_TRNS, MI_Gs,
+        MI_Ds, KC_TRNS, KC_TRNS, MI_As,
+        MI_F , KC_TRNS, KC_TRNS, MI_C ,
+        MI_Fs, KC_TRNS, KC_TRNS, MI_Cs,
+             KC_TRNS, KC_TRNS),
+    [_FLAT] = LAYOUT(
+        MI_B , KC_TRNS, KC_TRNS, MI_Gb,
+        MI_Db, KC_TRNS, KC_TRNS, MI_Ab,
+        MI_Eb, KC_TRNS, KC_TRNS, MI_Bb,
+        MI_E , KC_TRNS, KC_TRNS, MI_B,
+             KC_TRNS, KC_TRNS),
+};