[Keyboard] Add Hex4B rev.2 PCB (#15811)

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

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+# hex4b
+
+![hex4b](https://i.imgur.com/lArfGgHh.jpeg)
+
+A PCB for HEX.4B 75% keyboard.
+
+* Keyboard Maintainer: [Mechlovin' Studio](https://github.com/mechlovin)
+* Hardware Supported: Hex.4B Rev.2 PCB, APM32F103CBT6
+* Hardware Availability: [Hex Keyboard](https://hexkeyboards.com/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make mechlovin/hex4b/rev2:default
+
+Flashing example for this keyboard:
+
+    make mechlovin/hex4b/rev2: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 key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Bootloader reset**: Hold down the key at (0,13) in the matrix (Backspace) and plug in the keyboard
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+* **Hardware reset**: Press reset button (located on the top side of the PCB)
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