[Keyboard] Idobao ID80 V3 (#15912)

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

keyboards/idobao/id80/v3/readme.md

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+# ID80v3
+
+![ID80v3](https://i.imgur.com/PGvZfQj.jpg)
+
+A 75% hotswap in-switch RGB keyboard with an encoder.
+
+* Keyboard Maintainer: [peepeetee](https://github.com/peepeetee)
+* Hardware Supported: ID80v3
+* Hardware Availability: Not avaliable yet
+
+Make example for this keyboard (after setting up your build environment):
+
+    make idobao/id80/v3:default
+
+Flashing example for this keyboard:
+
+    make idobao/id80/v3: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
+* **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