[Keyboard] Add MIO keyboard (#11852)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/mio/mio.h

@@ -0,0 +1,44 @@
+/* Copyright 2021 recompile keys
+ *
+ * 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( \
+    K000,           K002,   K003,   K004,   K005,   K006,   K007, \
+    K100,   K101,   K102,   K103,   K104,   K105,   K106,   K107, \
+    K200,   K201,   K202,   K203,   K204,   K205,   K206, \
+    K300,   K301,   K302,   K303,   K304,   K305,   K306, \
+    K400,   K401,   K402,   K403,   K404,   K405,   K406, \
+    K500,   K501,   K502,                   K505,   K506  \
+) \
+{ \
+    { K000,   KC_NO,  K002,   K003,   K004,   K005,   K006,   K007  }, \
+    { K100,   K101,   K102,   K103,   K104,   K105,   K106,   K107  }, \
+    { K200,   K201,   K202,   K203,   K204,   K205,   K206,   KC_NO }, \
+    { K300,   K301,   K302,   K303,   K304,   K305,   K306,   KC_NO }, \
+    { K400,   K401,   K402,   K403,   K404,   K405,   K406,   KC_NO }, \
+    { K500,   K501,   K502,   KC_NO,  KC_NO,  K505,   K506,   KC_NO }, \
+}