[Keyboard] LW75 Support (#19506)

Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/lw75/readme.md

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+# LW-75
+
+![LW75](https://i.imgur.com/JczcWsmh.jpg)
+
+A 75% Keyboard with a LHS rotary encoder, made and sold by Laneware Peripherals.
+
+* Keyboard Maintainer: [Laneware Peripherals](https://github.com/laneware)
+* Hardware Supported: LW-75
+* Hardware Availability: [Laneware Peripherals](https://lanewareperipherals.com/), 
+
+Make example for this keyboard (after setting up your build environment):
+
+    make lw75:default
+    
+Flashing example for this keyboard:
+    make lw75:default:flash
+
+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 2 ways:
+
+* **Bootmagic reset**: Hold down the encoder and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB