Add server usage example

README.md

@@ -1,6 +1,33 @@
 # Maputnik Desktop
 
 A Golang based cross platform executable for integrating Maputnik locally.
+The idea is to package up the JavaScript and CSS bundle produced by [maputnik/editor](https://github.com/maputnik/desktop)
+and embed it in the server program.
+
+### Usage
+
+*Not functional yet*
+
+Simply start up a web server and access the Maputnik editor GUI at `localhost:8000`.
+
+```
+maputnik
+```
+
+Expose a local style file to Maputnik allowing the web based editor
+to save to the local filesystem.
+
+```
+maputnik --file basic-v9.json
+```
+
+Watch the local style for changes and inform the editor via web socket.
+This makes it possible to edit the style with a local text editor and still
+use Maputnik.
+
+```
+maputnik --watch --file basic-v9.json
+```
 
 ### Build