fix typo and add install instructions to README
fix typo and add install instructions to README

thollingshead/arcgis-server-store,btfou/dojo-esri-arcgis-server-store,thollingsheadesri/dojo-esri-arcgis-server-store,thollingshead/arcgis-server-store,thollingsheadesri/arcgis-server-store,thollingsheadesri/arcgis-server-store,thollingsheadesri/dojo-esri-arcgis-server-store,btfou/dojo-esri-arcgis-server-store