Add README.md to example_camera

example_camera/README.md

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+# Camera Example
+
+This example demonstrates the possibility to use camera input as a texture source. Make sure you clone the [ofxRPiCameraVideoGrabber](https://github.com/jvcleave/ofxRPiCameraVideoGrabber) addon into your `openFrameworks/addons` folder before compiling on Raspberry Pi.
+
+```
+cd openFrameworks/addons
+git clone https://github.com/jvcleave/ofxRPiCameraVideoGrabber.git
+```
+