Update README.md

README.md

 # openWSPR Receiver
 
+[openWSPR.com](https://openWSPR.com)
+
 OpenWSPR receiver is a stand-alone HF receiver for [WSPR](https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software)) signals. The main PCB is a shield compatible with NanoPi Neo.
 
 ## Schematic