Updated the readme with usage instructions.

readme.md

@@ -2,7 +2,7 @@
 
 Builds the blockdown data from the blockdown content.
 
-### Development
+## Development
 
 	./install
 
@@ -10,7 +10,21 @@ To use, run:
 
 	./dev
 
-### Production
+## Usage
+
+To see the site, visit `http://localhost:3000`
+
+To update (locally):
+
+  1. Make a change to a Blockdown file in *~/ind.ie.blockdown-builder/content/*
+  2. `git commit -am "Your change"`
+  3. `git push`
+
+At this point, your commit will simulate the Gitlab web hook that the production environment uses and trigger the Blockdown build process. That, in turn, will push to the local site.
+
+Visit `http://localhost:3000` to see the updated site and *~/ind.ie.blockdown-builder/site-local/blockerList.json* for the updated WebKit blocker list.
+
+## Production
 
 (I’m sorry there isn’t a more automated process at the moment. Configuration of the deployment environment involves the manual set up and configuration of a number of servers and Git repositories at the moment.)