update readme

Author: jwerts

README.md

@@ -1,2 +1,11 @@
 # jsapi4-angular2
-Testing esri jsapi4 with angular 2
+Angular 2 / ESRI Javascript API 4.0 simple map with unit testing wired up.
+
+```
+npm install
+npm start
+```
+
+Originally forked/derived from:
+- @odoe: https://github.com/odoe/esrijs4-vm-angular2
+- @tomwayson: https://github.com/tomwayson/angular2-esri-example