[Keyboard] Add royal directory and add 2 keyboard releases (#8877)

* add royal project folder and 2 released keyboards

* fix iso keymap clarification

* Apply suggestions from code review

* Update keyboards/the_royal/schwann/schwann.h

* Update keyboards/the_royal/liminal/liminal.h

* Update keyboards/the_royal/schwann/keymaps/default/keymap.c

* Apply suggestions from code review

new

* Update keymap.c

* Update keymap.c

* Apply suggestions from code review

* Update rules.mk

* add rules.mk to schwann default

* Apply suggestions from code review

* add rules.mk to shwann default

keyboards/the_royal/liminal/config.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0x4B4B
+#define PRODUCT_ID      0x0002
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    TheRoyalSweatshirt
+#define PRODUCT         Liminal
+#define DESCRIPTION     "A 50% keyboard with focused around spectacular keycap compatibility."
+
+/* key matrix size */
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 14
+
+#define MATRIX_ROW_PINS { C6, B6, B7, C7 }
+#define MATRIX_COL_PINS { D6, C4, D3, D2, D1, D0, C2, B0, B1, B2, B3, B4, D5, C5 }
+#define UNUSED_PINS
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* Set 0 if debouncing isn't needed */
+#define DEBOUNCE 5
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* ws2812 RGB LED */
+#define RGB_DI_PIN D4
+#define RGBLED_NUM 1   // Number of LEDs
+
+#define RGBLIGHT_HUE_STEP 6
+#define RGBLIGHT_SAT_STEP 4
+#define RGBLIGHT_VAL_STEP 4