Add basic example README.md

example/README.md

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+# Base Example
+
+This example demonstrates basic functionality of ofxPiMapper.
+
+- Adding and editing mapping surfaces
+- Texture cropping
+- Video and image source
+- Generative FBO sources
+- Default keyboard shortcuts
+
+Click once to enter projection mapping mode. Then click and click to do the mapping. The `src/CrossSource` and `src/CustomSource` classes are custom FBO source examples. You can re-use them as starting points for your own generative, data-driven or interactive sources.
+
+There should be no problem compiling this on the Raspberry Pi. On other systems supporting **make** one should change the `addons.make` file and remove the `ofxOMXPlayer` line. For Mac OS with openFrameworks 0.9.8, delete the `ofxGui` files that are marked red from the project pane under `addons/ofxGui`.