fixed typos in readme file

modified the readme file

Added json files to gitignore

Factorisation of the harvest function in the main.py Added a collect function to collect data from every worker

Added the third worker Baud rate set to 115200. First test with all worker is all good

Change footprint of the single header connector

json changes

Changed the baud rate to 19.2k to accomodate the new Fo of 300 kHz

Updated ports to add a new master the master is now a worker board

Merge pull request #4 from armercier/power_supply_V1 Power supply v1