Filling in the readme

README.md

@@ -1,4 +1,43 @@
 mdns
 ====
 
-Simple mDNS client/server library in Golang
+Simple mDNS client/server library in Golang. mDNS or Multicast DNS can be
+used to discover services on the local network without the use of an authoritative
+DNS server. This enables peer-to-peer discovery. It is important to note that many
+networks restrict the use of multicasting, which prevents mDNS from functioning.
+Notably, multicast cannot be used in any sort of cloud, or shared infrastructure
+environment. However it works well in most office, home, or private infrastructure
+environments.
+
+Using the library is very simple, here is an example of publishing a service entry:
+
+    // Setup our service export
+    host, _ := os.Hostname()
+    service := &mdns.MDNSService{
+	    Instance: host,
+	    Service: "_foobar._tcp",
+	    Addr:    []byte{127,0,0,1},
+	    Port:    8000,
+	    Info:    "My awesome service",
+    }
+    service.Init()
+
+    // Create the mDNS server, defer shutdown
+    server, _ := mdns.NewServer(&mdns.Config{Zone: service})
+    defer server.Shutdown()
+
+
+Doing a lookup for service providers is also very simple:
+
+    // Make a channel for results and start listening
+    entriesCh := make(chan *mdns.ServiceEntry, 4)
+    go func() {
+        for entry := range entriesCh {
+            fmt.Printf("Got new entry: %v\n", entry)
+        }
+    }()
+
+    // Start the lookup
+    mdns.Lookup("_foobar._tcp", entriesCh)
+    close(entriesCh)
+