Update README.md

Author: JASchilz

README.md

@@ -1,5 +1,8 @@
 [![Build Status](https://travis-ci.org/InterSIS/API.svg)](https://travis-ci.org/InterSIS/API)
+[![GitHub release](https://img.shields.io/github/release/InterSIS/API.svg)]()
 
 # API
 
-A fourth edit!
+InterSIS is an API and SDK for student/educator information and authentication, using OAuth 2.0. InterSIS delivers resources over a RESTful API using JSON.
+
+This repo provides the InterSIS API specification. Explore this spec at [explore.intersis.org](https://explore.intersis.org). Read more at [intersis.org](intersis.org).