added RoFish and adaptiveFreqOsc sketches

sketches/RoFish/README.md

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+# Robotic Fish
+
+A CPG-based locomotion control example of a robotic fish, implemented on the Arduino.
+
+Please visit:
+
+[https://github.com/MartinStokroos/RoFish](https://github.com/MartinStokroos/RoFish) 

sketches/adaptiveFreqOsc/README.md

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+# Adaptive Frequency Oscillator
+
+An Adaptive Frequency Oscillator demo for Arduino.
+
+Please visit:
+
+[https://github.com/MartinStokroos/adaptiveFreqOsc](https://github.com/MartinStokroos/adaptiveFreqOsc)