add a little info about how to install from npm

README.md

@@ -8,8 +8,21 @@ An implementation of ISO 13790-2008 and limited to only single-zone building def
 
 # Installation (npm)
 
+```
+npm install --save buildzero-energy-model
+```
+
 # Usage
 
+```
+var EnergyModel = require('buildzero-energy-model');
+
+// check out the example.js file to see what the input data structures are meant to look like.  
+// better docs coming once things are more finalized.
+var modelResults = EnergyModel.thermalDemand(buildingSettings, hourlyConditions, buildingElements, climateData);
+```
+
+
 # License
 
 Unless otherwise specified all BuildZero.org source files are made available under the terms of the MIT License (MIT).  See [LICENSE.txt](https://github.com/buildzero/energy-model/blob/master/LICENSE.txt) for details.