[Keyboard] Added A. Dux keyboard configurations (#14320)

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

keyboards/a_dux/a_dux.h

@@ -0,0 +1,47 @@
+/* Copyright 2018-2020 ENDO Katsuhiro <ka2hiro@curlybracket.co.jp> David Philip Barr <@davidphilipbarr> Pierre Chevalier <pierrechevalier83@gmail.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 "quantum.h"
+
+/* This 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.
+ */
+
+// readability
+#define ___ KC_NO
+
+#define LAYOUT( \
+        L01, L02, L03, L04, L05, R01, R02, R03, R04, R05, \
+        L06, L07, L08, L09, L10, R06, R07, R08, R09, R10, \
+        L11, L12, L13, L14, L15, R11, R12, R13, R14, R15, \
+                       L16, L17, R16, R17                 \
+    ) \
+    { \
+        { L01, L02, L03, L04, L05 }, \
+        { L06, L07, L08, L09, L10 }, \
+        { L11, L12, L13, L14, L15 }, \
+        { L16, L17, ___, ___ , ___}, \
+        { R01, R02, R03, R04, R05 }, \
+        { R06, R07, R08, R09, R10 }, \
+        { R11, R12, R13, R14, R15 }, \
+        { R16, R17, ___, ___, ___ }  \
+    }
+