Readme - Add example for apollo-server-express and CommonJS imports (#192)

* Fix missing comma

* Add 'apollo-server-express and CommonJS imports' example

* Fix for better 'yourTypeDefs' / 'yourResolvers'

Author: cedric25

README.md

@@ -170,7 +170,7 @@ const myResolverMap = {
 
   USCurrency: USCurrencyResolver,
   JSON: JSONResolver,
-  JSONObject: JSONObjectResolver
+  JSONObject: JSONObjectResolver,
 
   Query: {
     // more stuff here
@@ -299,6 +299,29 @@ const server = new ApolloServer({
 });
 ```
 
+### Usage with apollo-server-express and CommonJS imports
+
+```javascript
+const { ApolloServer } = require('apollo-server-express');
+// Import individual scalars and resolvers
+const { DateTimeResolver, DateTimeTypeDefinition } = require('graphql-scalars');
+
+const server = new ApolloServer({
+  typeDefs: [
+    DateTimeTypeDefinition,
+    ...yourTypeDefs,
+  ],
+  resolvers: [
+    { DateTime: DateTimeResolver }, // <-- Notable difference here
+    ...yourResolvers,
+  ],
+});
+
+server.listen().then(({ url }) => {
+  console.log(`🚀 Server ready at ${url}`);
+});
+```
+
 
 ### Using the RegularExpression scalar