Support for YMDK NP21 (#2316)

* ymdk_np21 initial support

Base support of ymdk_np21 - based on jj40. Full grid layout

* Update README.md

Replacing description.

* Adding YMDK NP21 to comunity list.

Adding YMDK NP21 to community supported list.

keyboards/ymdk_np21/ymdk_np21.h

@@ -0,0 +1,43 @@
+/*
+Copyright 2017 Luiz Ribeiro <luizribeiro@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/>.
+*/
+
+#ifndef KEYMAP_COMMON_H
+#define KEYMAP_COMMON_H
+
+#include "quantum.h"
+#include "quantum_keycodes.h"
+#include "keycode.h"
+#include "action.h"
+
+void matrix_init_user(void);  // TODO port this to other PS2AVRGB boards
+
+#define KEYMAP_GRID( \
+    K01, K02, K03, K04, K05, K06, \
+    K11, K12, K13, K14, K15, K16, \
+    K21, K22, K23, K24, K25, K26, \
+    K31, K32, K33, K34, K35, K36 \
+) \
+{ \
+  { K06, K05, K04, K03, K02, K01 }, \
+  { K16, K15, K14, K13, K12, K11 }, \
+  { K26, K25, K24, K23, K22, K21 }, \
+  { K36, K35, K34, K33, K32, K31 }  \
+}
+
+#define KEYMAP KEYMAP_GRID
+
+#endif