Mbsurfer deltasplit75 keymap (#3174)

* Add mbsurfer keymap for DeltaSplit75 with ANSI split backspace

* Update mbsurfer DeltaSplit75 keymap to include right hand arrow cluster

* Update mbsurfer DS75 keymap, move volume down to be symmetrical

* Add readme to Mbsurfer DS75 keymap

* Fix Mbsurfer DS75 keymap image

keyboards/deltasplit75/keymaps/mbsurfer/config.h

@@ -0,0 +1,31 @@
+/*
+Copyright 2012 Jun Wako <wakojun@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/>.
+*/
+
+
+#define USE_SERIAL
+
+#define MASTER_LEFT
+// #define MASTER_RIGHT
+// #define EE_HANDS
+
+
+#ifdef SUBPROJECT_v2
+    #include "../../v2/config.h"
+#endif
+#ifdef SUBPROJECT_protosplit
+    #include "../../protosplit/config.h"
+#endif