Updated Readme

README.md

@@ -2,10 +2,16 @@
 
 Access and stream web cam in nodejs using opencv and web sockets.
 
-#### Usage
+#### Building
+
+- It required opencv headers and library to build and run.
+- Modify `include_dirs` for headers path and `library_dirs` for library path in `binding.gyp` according to your opencv installation.
+- Then build with `node-gyp build`
+
+#### Running
 
 ```
-npm start -- [-open] [-wsport websocketPort] [-webport webserverport] [-ip ipaddress/domain]
+npm start -- [-open] [-wsport websocketPort] [-webport webserverport] [-ip ipaddress/domain] [-res widthxheight]
 ```
 
 | Option | Description |
@@ -14,3 +20,4 @@ npm start -- [-open] [-wsport websocketPort] [-webport webserverport] [-ip ipadd
 |-wsport | Web socket port for streaming media |
 |-webport | Web server port |
 |-ip | Domain name/ip for non-localhost clients |
+|-res | Resolution for preview image |