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

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

keyboards/tweetydabird/lbs4/readme.md

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+# Little Big Scroll 4
+
+![lsb4](https://i.imgur.com/MMGSDz2h.jpeg)
+
+* A simple 4-key or 2-key plus OLED macropad with a clickable scrollwheel, for media controls and whatever else you can imagine.*
+
+* Keyboard Maintainer: [Markus Knutsson](https://github.com/TweetyDaBird/)
+* Hardware Supported: LBS4 PCB plus Pro Micro or pin compatible
+* Hardware Availability: https://lectronz.com/stores/tweetys-wild-thinking
+* Hardware Design: https://github.com/TweetyDaBird/Little-Big-Scroll
+
+
+Make example for this keyboard (after setting up your build environment):
+
+    make tweetydabird/lbs4:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. 
+Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the top left key and plug in the keyboard
+* **Physical reset**: Briefly short the marked pads on PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if mapped (not in default keymap)