message: No need to create an executabke schema for graphql-codegen
diff: @@ -20,8 +20,8 @@ import 'reflect-metadata';
  import { AppModule } from './modules/app.module';
  import { makeExecutableSchema } from 'graphql-tools';
  -// Get typeDefs from top module, and create a schema without resolvers and other business logic
  -export default makeExecutableSchema({ typeDefs: AppModule.typeDefs });
  +// Get typeDefs from top module, and export it.
  +export default AppModule.typeDefs;
  ```
  Then, add a script in `package.json` to generate types easily.
  