Add KPRepublic/BM40hsrgb rev2 (#16689)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: jack <0x6a73@protonmail.com>

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+# bm40hsrgb
+
+![BM40 RGB](https://i.imgur.com/eOqXMlNh.jpg)
+
+An ortholinear 40% hotswap keyboard with per-key RGB in-switch LEDs and RGB Backlighting, from KP Republic.
+
+This firmware was originally taken from a kbfirmware.json and manually converted. You may find the original `.json` files [here](https://drive.google.com/drive/folders/1tlTHQIFcluK2mjZ4UbbKCsdRLgSRSPw6).
+
+* Keyboard Maintainer: [rgoulter](https://github.com/rgoulter)
+* Hardware Supported: bm40hsrgb PCB
+* Hardware Availability: [KPRepublic](https://www.aliexpress.com/item/4001147779116.html)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kprepublic/bm40hsrgb/rev2:default
+
+Flashing example for this keyboard:
+
+    make kprepublic/bm40hsrgb/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
+
+There are multiple ways to enter the bootloader so that firmware can be flashed onto the keyboard:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (the top left key) and plug in the keyboard.
+* **Physical reset button**: Briefly press the button labeled 'RST' on the back of the PCB.
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available.