added doc

Author: matryer

doc.go

@@ -0,0 +1,19 @@
+// Package graphql provides a low level GraphQL client.
+//
+//     ctx := context.Background()
+//     ctx = graphql.NewContext(ctx, "https://machinebox.io/graphql")
+//     r := graphql.NewRequest(`
+//         query ($key: String!) {
+//	           items (id:$key) {
+//	               field1
+//                 field2
+//                 field3
+//             }
+//         }
+//     `)
+//     r.Var("key", "value")
+//     var res ResponseStruct
+//     if err := r.Run(ctx, &resp); err != nil {
+//         log.Fatalln(err)
+//     }
+package graphql