[Keyboard] Add rb18 keyboard (#17306)

keyboards/ryanbaekr/rb18/rb18.h

@@ -0,0 +1,35 @@
+/* Copyright 2022 ryanbaekr
+ *
+ * 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"
+
+#define ___ KC_NO
+
+#define LAYOUT_numpad_5x4(         \
+    k00, k11, k02, k03, \
+    k10, k21, k12,      \
+    k20, k31, k22, k13, \
+    k30, k41, k32,      \
+    k40,      k42, k33  \
+){ \
+    { k00, ___, k02, k03 },  \
+    { k10, k11, k12, k13 },  \
+    { k20, k21, k22, ___ },  \
+    { k30, k31, k32, k33 },  \
+    { k40, k41, k42, ___ }   \
+}