adding a graphql-yoga example with playground (graphiql) built-in

Author: jon-lewis

graphql-yoga-helloworld/.gitignore

@@ -0,0 +1,2 @@
+node_modules
+.serverless

graphql-yoga-helloworld/handler.js

@@ -0,0 +1,20 @@
+const { GraphQLServerLambda } = require("graphql-yoga");
+var fs = require("fs")
+
+const typeDefs = fs.readFileSync("./schema.gql").toString('utf-8');
+
+const resolvers = {
+    Query: {
+        "hello": () => {
+            return 'pickles';
+        }
+    }
+};
+
+const lambda = new GraphQLServerLambda({
+    typeDefs,
+    resolvers
+});
+
+exports.server = lambda.graphqlHandler;
+exports.playground = lambda.playgroundHandler;