Update README.md
Update README.md
starting filters implementation
Prepared Shell and MIDI Interfaces to Filters

Inserted shell ui functions to setup filter paramethers and filter time,
and added instructions to control filter cutoffs with controller midi
(92 for cutoff frequence of LP and HP, 92-93 for low-high bands of
bandpass filter). Prepared the code to process signal with filters,
but filters still need back-end implementation... it might take a
while...
Merge branch 'filter_dev' of github.com:michelesr/MikeSimpleOsc into filter_dev