The structure of an app is as follows:
appName/
http/
endpointName/ # Folder for an HTTP Lambda Function
index.js
models/ # All your models
ModelName.yml # Schema for a model
prerender/
pug/ # Prerender pug templates
config.js # Prerender configuration
private/ # Private configuration files
public/ # Public site files
index.html # The main page for your app.
svc/
ServiceName/ # Folder for a Service Lambda Function
index.js
Note that all top-level folders are optional.