update readme with current state

README.md

@@ -1,4 +1,19 @@
-dockviz
+# dockviz
-=======
 
-Visualizing docker data
+Visualizing Docker Data
+
+This command takes the raw Docker JSON and visualizes it in various ways.  The
+only thing that works so far is [Graphviz](http://www.graphviz.org), but others
+will come.
+
+# Running
+
+Currently, this only works when the remote API is listening on TCP.  Soon, the Docker command line will allow dumping the image JSON.
+
+```
+$ curl -s http://localhost:4243/images/json?all=1 | ./dockviz images -d > images.dot
+```
+
+# Download
+
+For now, download binaries from Gobuild: <http://gobuild.io/download/github.com/justone/dockviz>