Update README file with example for setColorByName().

Author: samaphp

README.md

@@ -1,2 +1,12 @@
 # lifxlan
-LifxLan protocol.
+LifxLan protocol. (Work in progress)
+
+Note: This library is not ready for use in production. And does not cover all API capabilities. I just built it for my self to 
+
+**Setting light color by name:**
+```
+$light_ip = '192.168.1.x';
+$Light = new Light($light_ip);
+$brightness = 40;
+$Light->setColorByName('white_warm', $brightness);
+```