Added new keyboard DOIO KB16 (Rev 2) (#18699)

keyboards/doio/kb16/rev2/readme.md

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+# KB16-01 (Revision 2)
+
+![KB16-01](https://i.imgur.com/lpq47ELh.png)
+
+A macropad that have 16-key keyboard made by DOIO, which controlled by an APM32F103CBT6 chipset. The keyboard features per-key RGB, 3 encoder and an OLED screen for displaying useful information.
+
+* Keyboard Maintainer: [HorrorTroll](https://github.com/HorrorTroll)
+* Hardware Supported: APM32F103CBT6
+
+Make example for this keyboard (after setting up your build environment):
+
+    `make doio/kb16/rev2:default`
+    or with the qmk cli:
+    `qmk compile -kb doio/kb16/rev2 -km default`
+
+Flashing example for this keyboard:
+
+    `make doio/kb16/rev2:default:flash`
+    or with the qmk cli:
+    `qmk flash -kb doio/kb16/rev2 -km default`
+
+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 (1! key) 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 `QK_BOOT` if it is available