Expand README ✍️

Author: IvanGoncharov

README.md

@@ -1 +1,22 @@
-# graphql-coverage
+# graphql-coverage
+
+## Install
+
+    npm install -g graphql-coverage
+or
+
+    yarn global add graphql-coverage
+
+
+## TL;DR
+
+Show which resolvers are triggered by your GraphQL queries:
+
+    graphql-coverage <URL to your API>
+
+## Goals
+
+Proof of concept developed specially for [GraphQL: The next Level of API Tooling](https://nordicapis.com/?post_type=sessions&p=6681) talk at [Platform Summit 2017](https://nordicapis.com/events/the-2017-api-platform-summit/) with the following goals:
+* Less than 100 lines
+* Works with any GraphQL API
+* Do something useful