Add badges

Author: ccuilla

README.md

@@ -1,7 +1,9 @@
 # @okgrow/graphql-scalars
 
-A library of custom GraphQL [scalar types](http://graphql.org/learn/schema/#scalar-types) for creating precise type-safe GraphQL schemas.
+[![npm version](https://badge.fury.io/js/%40okgrow%2Fgraphql-scalars.svg)](https://badge.fury.io/js/%40okgrow%2Fgraphql-scalars)
+[![Build Status](https://semaphoreci.com/api/v1/projects/649ab71f-35fe-440e-8e4b-3f68aaad0f2a/1545482/badge.svg)](https://semaphoreci.com/okgrow/graphql-scalars)
 
+> A library of custom GraphQL [scalar types](http://graphql.org/learn/schema/#scalar-types) for creating precise type-safe GraphQL schemas.
 
 ## Installation
 ```