update README

README.md

@@ -3,6 +3,9 @@
 The is a minimal template that has a little HTML, CSS, and js to help
 you start writing an Open Web App.
 
+This is part of the [mortar](https://github.com/mozilla/mortar/)
+template collection for building Open Web Apps.
+
 # Usage
 
 There are a few ways to get this template:
@@ -15,4 +18,4 @@ If you have node installed, you can run a development server with volo:
 * cd myapp
 * volo serve
 
-View the list/detail app at http://localhost:8008/.
+View the app at http://localhost:8008/.