[Keyboard] Initial commit for mc76k (#8000)

* Initial commit for mc76k

* Update config.h

keyboards/mc_76k/mc_76k.c

@@ -0,0 +1,34 @@
+/* Copyright 2020 Yiancar-Designs
+ *
+ * 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 "mc_76k.h"
+
+void keyboard_pre_init_kb (void) {
+  setPinOutput(D2);
+}
+
+bool led_update_kb(led_t led_state) {
+  bool res = led_update_user(led_state);
+  if(res) {
+    // writePin sets the pin high for 1 and low for 0.
+    // In this example the pins are inverted, setting
+    // it low/0 turns it on, and high/1 turns the LED off.
+    // This behavior depends on whether the LED is between the pin
+    // and VCC or the pin and GND.
+    writePin(D2, !led_state.caps_lock);
+  }
+  return res;
+}