add usage example to README.
add usage example to README.

OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/eteroj.lv2,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/orbit.lv2,OpenMusicKontrollers/varchunk,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/eteroj.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/orbit.lv2,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/moony.lv2