Enough instructions that other people actually could try playing with this.

README.md

@@ -2,13 +2,31 @@
 
 Exploratory add-ons based on the MicroWorld engine, probably of interest only to me.
 
+Not strictly speaking part of MicroWorld; the rest of the system works fine without this.
+
+## Pre-requisites
+
+You need **git**, **leiningen** and **mw-engine**
+
+How you install [git](http://git-scm.com/) depends on your operating system; look for instructions [here](http://git-scm.com/book/en/v2/Getting-Started-Installing-Git).
+
+To install [leiningen](http://leiningen.org/), follow the instructions [here](http://leiningen.org/#install).
+
+To install [mw-engine](https://github.com/simon-brooke/mw-engine), do the following:
+
+	git clone https://github.com/simon-brooke/mw-engine.git
+    cd mw-engine
+    lein install
+
+You should then be good to go.
+
 ## Usage
 
 Ideally, use
 
     lein gorilla
 
-Then browse to the URL you're prompted with.
+Then browse to the URL you're prompted with. From the menu, choose 'Load a worksheet'; currently you'll only find one. Play.
 
 ## License