update README.md

Author: Links2004

README.md

@@ -1,3 +1,33 @@
-# arduinoWebSockets
+WebSocket Server and Client for Arduino
+===========================================
 
-a WebSocket Server and Client for arduino based on RFC6455
+a WebSocket Server and Client for Arduino based on RFC6455.
+
+##### Supported features of RFC6455 #####
+ - text frame
+ - binary frame
+ - connection close
+ - ping
+ - pong
+ 
+##### Not supported features of RFC6455 #####
+ - continuation frame
+  
+##### Limitations #####
+ - max input length is limited to the ram size and the ```WEBSOCKETS_MAX_DATA_SIZE``` define
+ - max output length has no limit (the hardware is the limit)
+ - Client send masked frames always with mask 0x00000000 (open todo)
+
+##### Supported Hardware #####
+ - ESP8266 [Arduino for ESP8266](https://github.com/Links2004/Arduino)
+ - ATmega328 with Ethernet Shield (planed)
+ - ATmega328 with enc28j60 (planed)
+
+### Issues ###
+Submit issues to: https://github.com/Links2004/arduinoWebSockets/issues
+
+### License and credits ###
+
+The library is licensed under LGPLv2.1.
+
+[libb64](http://libb64.sourceforge.net/) written by Chris Venter. It is distributed under Public Domain see [LICENSE](https://github.com/Links2004/arduinoWebSockets/blob/master/src/libb64/LICENSE).