Add licence badge

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diff --git a/README.md b/README.md
index 84daeb7..866b186 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![Hackage Version](https://img.shields.io/hackage/v/graphql.svg)](https://hackage.haskell.org/package/graphql)
 [![Build Status](https://semaphoreci.com/api/v1/belka-ew/graphql/branches/master/badge.svg)](https://semaphoreci.com/belka-ew/graphql)
+[![License](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://raw.githubusercontent.com/caraus-ecms/graphql/master/LICENSE)
 
 For now this only provides the data types to represent the GraphQL AST,
 but the idea is to be a Haskell port of