[Keyboard] add molecule (#12601)

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

keyboards/molecule/molecule.h

@@ -0,0 +1,40 @@
+/* Copyright 2021 bbrfkr
+ *
+ * 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/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT( \
+  L00, L01, L02, L03, L04,      R00, R01, R02, R03, R04, \
+  L10, L11, L12, L13, L14,      R10, R11, R12, R13, R14, \
+  L20, L21, L22, L23, L24,      R20, R21, R22, R23, R24, \
+  L30, L31, L32, L33, L34,      R30, R31, R32, R33, R34  \
+  ) \
+  { \
+    { L00, L01, L02, L03, L04, R00, R01, R02, R03, R04 }, \
+    { L10, L11, L12, L13, L14, R10, R11, R12, R13, R14 }, \
+    { L20, L21, L22, L23, L24, R20, R21, R22, R23, R24 }, \
+    { L30, L31, L32, L33, L34, R30, R31, R32, R33, R34 }, \
+  }