added graphql provider test

pact/pact-node-provider/routes/graphql.js

@@ -0,0 +1,36 @@
+const graphqlHTTP = require('express-graphql');
+const {buildSchema} = require("graphql");
+
+const heroesSchema = buildSchema(`
+  type Query {
+    hero(id: Int!): Hero
+  }
+
+  type Hero {
+    id: Int!
+    name: String!
+    superpower: String!
+    universe: String!
+  }
+`);
+
+const getHero = function () {
+    return {
+        id: 42,
+        name: "Superman",
+        superpower: "Flying",
+        universe: "DC"
+    }
+};
+
+const root = {
+    hero: getHero
+};
+
+const router = graphqlHTTP({
+    schema: heroesSchema,
+    graphiql: true,
+    rootValue: root
+});
+
+module.exports = router;