Update README.md

README.md

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-RateController is an add-on app that works with AgOpenGPS version 5 (https://github.com/farmerbriantee/AgOpenGPS/) for rate control. It can control up to 16 sections and 5 products either by flow-meter or motor rpm.
+RateController (RC) is an add-on app that works with AgOpenGPS (https://github.com/farmerbriantee/AgOpenGPS/) for product application rate control.
 
-Contents:
-1. rate module code and pcbs for Nano or Teensy
-2. switch module code and pcb for Nano
-3. relay controller pcb to mount on 8 or 16 channel relay boards
-4. wifi code for ESP8266 microcontroller mounted on some pcbs.
-5. rate app for windows
+For more information see the Wiki.