Add edvorakjp kepmap for crkbd (#4537)

* edvorakjp layout for crkbd

* bugfix of edvorakjp

QMK cannot send keycode that doesn't exists on new layer.

keyboards/crkbd/keymaps/edvorakjp/readme.md

@@ -0,0 +1,21 @@
+# edvorakjp
+
+Epaew's Enhanced Dvorak layout for Japanese Programmer  
+see [here](/users/edvorakjp) for more informations.
+
+## License
+
+Copyright 2018 Ryo Maeda epaew.333@gmail.com @epaew
+
+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/>.