[Keyboard] Add QVEX Lynepad 2.0 (#21070)

keyboards/qvex/lynepad2/readme.md

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+# QVEX Lynepad 2
+
+![QVEX Lynepad 2.1](https://i.imgur.com/eDvVaE4h.jpeg)
+
+*Macropad with 11 keys, thumbwheel, and a rotary 4-way switch*
+
+* Keyboard Maintainer: [QVEX Tech](https://github.com/QVEX-Tech) ([seflm](https://github.com/seflm))
+* Hardware Supported: QVEX Lynepad
+* Hardware Availability: [QVEX Lynepad on Tindie](https://www.tindie.com/products/qvex_tech/lynepad-21-hot-swap-macropad-w-joystick/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make qvex/lynepad:default
+
+Flashing example for this keyboard:
+
+    make qvex/lynepad: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 3 ways:
+
+* **Bootmagic reset**: Hold down the top left key and plug in the keyboard
+* **Physical reset button**: Briefly press the reset button on the back of the Lynepad using SIM tool (rev.2.0 or newer) 
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available