feat(README): add purpose statement

- I don't have the time to maintain a competitive ui framework.
- I will enjoy using the official set of components when they are ready.
- I'll try to put out 🔥s, but need more community support to keep things up-to-date.

README.md

@@ -2,7 +2,9 @@ ng2-material [![Build Status](https://travis-ci.org/justindujardin/ng2-material.
 ---
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/ng2material.svg)](https://saucelabs.com/u/ng2material)
 
-This is an *unofficial* implementation of Material Design components for Angular 2.
+## Purpose
+
+This is an implementation of [Material Design](https://www.google.com/design/spec/material-design/) components for Angular 2. It is meant to be a workable set of components that can be used until an official implementation is provided by Google. As the [angular/material2](https://github.com/angular/material2) components become more usable, this project will explore ways to migrate to the official implemntation.
 
 Check out the [examples site](https://justindujardin.github.io/ng2-material/) for demos and instructions on getting started.