[Keyboard] OSAv2 (#20166)

keyboards/viktus/osav2/readme.md

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+# OSAv2
+
+![osav2](https://i.imgur.com/CIDckmjh.png)
+
+The OSAv2 is the second version of the OSA and a complete overhaul in design.
+
+-   Keyboard Maintainer: [BlindAssassin111](https://github.com/blindassassin111)  
+-   Hardware Supported: OSAv2 PCB
+-   Hardware Availability: Viktus Design LLC
+
+Make example for this keyboard (after setting up your build environment):
+
+    make viktus/osav2:default
+
+Flashing example for this keyboard:
+
+    make viktus/osav2: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 - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available