[Keyboard] move That-Canadian 's boards into /maple_computing (#16050)

keyboards/maple_computing/lets_split_eh/keymaps/romus/README.md

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+# Lets Split Eh Layout
+
+Check out [user readme](../../../../users/romus/README.md) for more info.
+
+# Usage
+
+Fill in after flashing

keyboards/maple_computing/lets_split_eh/keymaps/romus/keymap.c

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+#include QMK_KEYBOARD_H
+#include "romus.h"
+
+
+void matrix_init_keymap (void) {
+}
+
+uint32_t layer_state_set_keymap(uint32_t state) {
+	
+    return state;
+}
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    // Main Dvorak layer
+    [_DV] = LAYOUT_letssplit_wrapper(DVORAK),
+    // Turkish and special character overlay
+    [_AL] = LAYOUT_letssplit_wrapper(ALTCHAR),
+    // Gaming layer
+    [_GA] = LAYOUT_letssplit_wrapper(GAME),
+    // Numbers layer
+    [_NU] = LAYOUT_letssplit_wrapper(NUMBERS),
+    // Settings layer
+    [_SE] = LAYOUT_letssplit_wrapper(SETTINGS),
+    // Mouse emulation layer
+    [_MO] = LAYOUT_letssplit_wrapper(MOUSE),
+    // Music layer
+    [_MU] = LAYOUT_letssplit_wrapper(MUSIC),
+};

keyboards/maple_computing/lets_split_eh/keymaps/romus/rules.mk

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+# Build options
+
+BACKLIGHT_ENABLE = no		# Switch LEDs
+MOUSEKEY_ENABLE = yes		# Emulates mouse key using keypresses
+RGBLIGHT_ENABLE = yes 		# LED strips
+TAP_DANCE_ENABLE = yes 		# Use multi-tap features
+AUDIO_ENABLE = no 			# Audio stuff