Complete documentation

WiFiWebServer/WiFiWebServer.ino

@@ -3,6 +3,8 @@
  *  The server will set a GPIO pin depending on the request
  *    http://server_ip/gpioX/0 will set the GPIOX low,
  *    http://server_ip/gpioX/1 will set the GPIOX high,
+ *    http://server_ip/gpioX will return GPIOX value,
+ *    http://server_ip/mode/gpioX/Y will set the GPIOX mode to Y (with Y in 0=INPUT, 1=OUTPUT, 2=INPUT_PULLUP),
  *  server_ip is the IP address of the ESP8266 module, will be
  *  printed to Serial when the module is connected.
  */