Clean up examples directory, add a README

examples/README.md

examples/config/default.json

examples/config/multi-device.json

examples/config/networked.json

examples/processing/clouds/OPC.pde

examples/processing/clouds/clouds.pde

examples/processing/dot/OPC.pde

examples/processing/dot/data/dot.png

examples/processing/dot/dot.pde

examples/processing/mapper2d/OPCLowLevel.pde

examples/processing/mapper2d/mapper2d.pde

examples/processing/orbits/OPC.pde

examples/processing/orbits/data/dot.png

examples/processing/orbits/greenDot.png

examples/processing/orbits/orbits.pde

examples/processing/orbits/purpleDot.png

examples/processing/sequencer/OPC.pde

examples/processing/sequencer/data/checkers.png

examples/processing/sequencer/data/glass.jpeg

examples/processing/sequencer/data/greenDot.png