started blinkisync doku

blinkisync.md

+### blinkisync
+
+From firmware version 1.8 you will be able to send and receive text via light with your Card10.
+
+You can exchange contacts, exchange secret notes, embed messages into your LED spotlights, ...
+
+#### usage of the app
+Choose blinkisync-receive for receiving transmissions and blinkisync-transmit for transmitting text. 
+
+#### Protocol:
+
+Text gets decoded to zero padded utf-8 bytes and bits translated to LED on or off with a timing of 150ms.
+In front of the data bytes is a special start byte and there is a timing signal after each byte. The end signal is 8 bits of 0.
+
+Start byte:
+`00000101`
+
+Timing byte:
+`1011`
+
+End byte:
+`00000000`
+
+Example:
+hello world:
+`00000101 1011 01101000 1011 01100101 1011 01101100 1011 01101100 1011 01101111 1011 00100000 1011 01110111 1011 01101111 1011 01110010 1011 01101100 1011 01100100 1011 00000000`