New layout for XD60/64 (#1748)

* Add yuuki keymap

Documentation is still a TODO and the keymap may not be final

* GRV on colon

* add KC_GRV to FN ESC

* hhkb ish

* hhkbish 2

* HHKBish and documentation

* Fix Markdown warnings

* typo

keyboards/xd60/keymaps/yuuki/README.md

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+# yuuki's Layout
+
+Customized xd60 keymap with inspirations from HHKB and the layout I used on my Vortex Core (a 40% keyboard).
+
+## Programming Instructions
+
+Change the layout in `keymap.c` then run `make xd60-yuuki`. The compiled file will be located in `.build/xd60_yuuki.hex` relative to the project root. To flash it onto your keyboard, use whatever program works on your OS. I personally use `dfu-programmer`, and run:
+
+* `sudo dfu-programmer atmega32u4 erase`
+* `sudo dfu-programmer atmega32u4 flash .build/xd60-yuuki.hex`
+* `sudo dfu-programmer atmega32u4 start`
+
+## Layout
+
+See `keymap.c` for the details, but here are the important features:
+
+| Key                        | Function                           |
+| -------------------------- | ---------------------------------- |
+| Capslock | Forward Slash when tapped and Left Control when held |
+| Left Control | Temporarily activate function layer |
+| FN + ESC | Grave |
+| Space Cadet Shift | Left Shift tapped writes ( and Right Shift tapped writes )  |
+| FN + HJKL | Arrow Keys |
+| Rightmost key in second row from bottom | Temporarily activate function layer |
+| FN + C | ^ |
+| FN + V | & (both for convenience as I use these keys a lot with VIM navigation and I find them hard reach) |

keyboards/xd60/keymaps/yuuki/keymap.c

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+#include "xd60.h"
+#include "action_layer.h"
+
+#define BASE 0
+#define FN 1
+
+#define CTL_SLSH CTL_T(KC_SLSH)
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+  // 0: Base Layer
+  [BASE] = KEYMAP(
+      KC_ESC,    KC_1,    KC_2,     KC_3,     KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,     KC_0,     KC_MINS,  KC_EQL,   KC_BSPC,  KC_BSPC,   \
+      KC_TAB,    KC_Q,    KC_W,     KC_E,     KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,     KC_P,     KC_LBRC,  KC_RBRC,            KC_BSLS,   \
+      CTL_SLSH,  KC_A,    KC_S,     KC_D,     KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,     KC_SCLN,  KC_QUOT,  KC_NO,              KC_ENT,    \
+      KC_LSPO,   KC_NO,   KC_Z,     KC_X,     KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM,  KC_DOT,   KC_NO,    KC_RSPC,  KC_UP,    MO(FN),    \
+      MO(FN),    KC_LGUI, KC_LALT,                              KC_SPC,                              KC_RALT,  KC_RCTL,  KC_LEFT,  KC_DOWN,  KC_RIGHT
+      ),
+  // 1: Function Layer
+  [FN] = KEYMAP(
+      KC_GRV,    KC_F1,   KC_F2,    KC_F3,    KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_DEL,   KC_DEL,    \
+      KC_TRNS,   RGB_MOD, RGB_VAI,  KC_TRNS,  KC_TRNS, KC_HOME, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,            KC_DEL,    \
+      KC_TRNS,   RGB_TOG, RGB_VAD,  KC_MUTE,  KC_VOLU, KC_VOLD, KC_LEFT, KC_DOWN, KC_UP,   KC_RIGHT, KC_TRNS,  KC_TRNS,  KC_NO,              KC_ENT,    \
+      KC_TRNS,   KC_NO,   KC_TRNS,  KC_TRNS,  KC_CIRC, KC_AMPR, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_PGUP,  KC_TRNS,   \
+      KC_TRNS,   KC_TRNS, KC_TRNS,                              KC_SPC,                              KC_TRNS,  KC_TRNS,  KC_HOME,  KC_PGDOWN,KC_END
+      ),
+
+};