[Keyboard] Idobao Montex V2(RGB) (#15865)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Christian Hofstede <4440939+chofstede@users.noreply.github.com>
Co-authored-by: Vino Rodrigues <github@m.vinorodrigues.com>
Co-authored-by: Vino Rodrigues <366673+vinorodrigues@users.noreply.github.com>

keyboards/idobao/montex/v1rgb/readme.md

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+# IDOBAO MONTEX RGB
+
+![MONTEX RGB](https://idobao.github.io/assets/img/idobao-id27.png)
+
+A hotswap RGB numpad from IDOBAO.
+
+* Keyboard Maintainer:
+  - [peepeetee](https://github.com/peepeetee)
+  - [vinorodrigues](https://github.com/vinorodrigues)
+  - [willi-on-fire](https://github.com/willi-on-fire)
+* Hardware Supported: IDOBAO MONTEX RGB
+* Hardware Availability: [Drop](https://drop.com/buy/idobao-montex-numpad-hotswappable-kit), [AliExpress](https://www.aliexpress.com/item/1005003885788698.html) & [IDOBAO.net](https://idobao.net/collections/20-layout/products/idobao-montex-pad-hot-swappable-keyboard-kit-%E7%9A%84%E5%89%AF%E6%9C%AC)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make idobao/montex/v1rgb:default
+
+Flashing example for this keyboard:
+
+    make idobao/montex/v1rgb: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 [Esc]) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available