Create v3.md

pages/v3.md

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+# Pi-KVM v3 Tech info
+
+# Installation
+1. [Build the device](https://www.youtube.com/watch?v=-SRL92VJ870).
+2. [Install the operatiog system](flashing_os.md) (choose the v3 image).
+3. Power it up
+4. If your kit includes the display and/or the fan, you'll need to turn them on after installation:
+   ```bash
+   rw
+   systemctl enable --now kvmd-oled # For the display
+   systemctl enable --now kvmd-fan  # For the fan
+   ro
+   ```
+   
+# v3 board ports
+<img src="../img/v3.png" alt="drawing" height="300"/>