[Keymap] adding keymaps (#3583)

* add key map

* QWERTY with 40% layers

* updated line 21

updated line 21 from "#include "xd75.h" to "#include QMK_KEYBOARD_H" as requested

* upload contra folders

* Update .directory

* Update config.h

* Update config.h

* Update keymap.c

* Update config.h

* Update rules.mk

* Update keyboards/contra/keymaps/martin_bac/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keyboards/xd75/keymaps/martin_cennum/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Delete .directory

* upload

* Delete rules.mk

* Update keyboards/contra/keymaps/msiu/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keyboards/katana60/keymaps/msiu/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keyboards/katana60/keymaps/msiu/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keyboards/katana60/keymaps/msiu/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keyboards/katana60/keymaps/msiu/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Delete nano.save

* Delete rules.mk

* Update keymap.c

* Update keymap.c

* Update config.h

* Update keyboards/lets_split_eh/keymaps/msiu/keymap.c

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keyboards/lets_split_eh/keymaps/msiu/keymap.c

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keymap.c

* Update keyboards/planck/keymaps/msiu/config.h

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Apply suggestions from code review

Co-Authored-By: martinmksiu <martinmksiu@gmail.com>

* Update keymap.c

* Update readme.md

* Update keymap.c

keyboards/contra/keymaps/msiu/config.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(PLANCK_SOUND)
+    // #define STARTUP_SONG SONG(NO_SOUND)
+
+    #define DEFAULT_LAYER_SONGS { SONG(QWERTY_SOUND), \
+                                  SONG(COLEMAK_SOUND), \
+                                  SONG(DVORAK_SOUND) \
+                                }
+#endif
+
+#define MUSIC_MASK (keycode != KC_NO)
+
+/*
+ * MIDI options
+ */
+
+/* Prevent use of disabled MIDI features in the keymap */
+//#define MIDI_ENABLE_STRICT 1
+
+/* enable basic MIDI features:
+   - MIDI notes can be sent when in Music mode is on
+*/
+                                
+#define MIDI_BASIC
+
+/* enable advanced MIDI features:
+   - MIDI notes can be added to the keymap
+   - Octave shift and transpose
+   - Virtual sustain, portamento, and modulation wheel
+   - etc.
+*/
+//#define MIDI_ADVANCED
+
+/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
+//#define MIDI_TONE_KEYCODE_OCTAVES 2