[Keyboard] Add Little Big Scroll 4 macropad (#18516)

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/tweetydabird/lbs4/keymaps/default/keymap.c

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+// Copyright 2022 Markus Knutsson (@TweetyDaBird)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,
+    _RGB
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+        KC_MPLY,
+		TO(_RGB),	KC_MSEL,	
+		KC_MPRV,	KC_MNXT
+    ),
+    [_RGB] = LAYOUT(
+        KC_MPLY,
+		TO(_BASE),	RGB_VAI,	
+		RGB_TOG,	RGB_VAD
+    )
+};
+
+bool encoder_update_user(uint8_t index, bool clockwise) {
+    if (index == 0) {
+		if (clockwise) {
+			tap_code(KC_VOLU);
+		} else {
+			tap_code(KC_VOLD);
+		}        
+	} 
+	return true;
+};

keyboards/tweetydabird/lbs4/keymaps/default/readme.md

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+# The default keymap for lbs4
+
+This is a very basic layout using LSB4 as media playback buttons. 
+
+![lsb4](https://imgur.com/hCDdQIc)