Finish updating this repository

[shimks]

There is still some follow up work that needs to be done after #78 (taken from my comment here)

• follow the instuctions on the README and update either the README or the code to make the repository's features apparent and complete
  • currently, following the steps on README will result in errors
• leverage lerna to resolve dependencies between services
• use automatic openapi-v3 schema decorators instead of explicitly defining schemas
  • unless that's the point of this repository. In that case, this repository should be archived until we fully commit to supporting top-down approach.
• use 'models' and their decorators to define custom types
• complete switching over repositories to extend from DefaultCrudRepository
• follow file naming convention advocated over here
• look into potentially switching from loopback-swagger-connector since LoopBack 4 no longer supports swagger-v2.

There may be a lot being covered in this issue, so it might be appropriate to turn this into an epic.

Description/Steps to reproduce

Link to reproduction sandbox

Expected result

Additional information

[dhmlau]

related to: loopbackio/loopback-next#669

[thinusn]

I think to make this example more useful we should definitely consider adding lerna

[dhmlau]

@thinusn , would you like to submit a PR? :)