Added a brief mission and link to launch process docs.

README.md

@@ -1,7 +1,9 @@
 Chrome Platform Status
 ==================
 
-[chromestatus.com](https://chromestatus.com/)
+### Mission
+
+[chromestatus.com](https://chromestatus.com/) is the official tool used for for tracking feature launches in Blink (the browser engine that powers Chrome and many other web browsers).  This tool guides feature owners through our [launch process](https://www.chromium.org/blink/launching-features/) and serves as a primary source for developer information that then ripples throughout the web developer ecosystem.
 
 ### Get the code