Add package overview & fix dead link

README.md

@@ -133,7 +133,7 @@ With the above result, the RTSP URL would be `rtsp://admin:12345@173.16.100.45:5
 
 ## Contribution
 
-See [the contribution document](/CONTRIBUTION.md) to get started.
+See [the contribution document](/CONTRIBUTING.md) to get started.
 
 ## Frequently Asked Questions
 

cmrdr.go

@@ -0,0 +1,14 @@
+// Package cmrdr provides methods to be able to discover and
+// attack RTSP streams easily. RTSP streams are used by most
+// IP Cameras, often for surveillance.
+//
+// A simple example usage of the library can be found in
+// https://github.com/EtixLabs/cameradar/tree/master/cameraccess
+//
+// The example usage is complete enough for most users to
+// ignore the library, but for users with specific needs
+// such as creating their own bruteforcing dictionary to
+// access cameras, or running their own network scan, this
+// library allows to use simple and performant methods to
+// attack streams.
+package cmrdr