first install dependencies
npm install
this app requres mongodb connection.
see app.module.ts for connection options, and make sure there are matching options for the mongodb installation and the source code
Then, run the app:
npm run start
this app exposes 2 endpoints:
GET /cats for retrieving cats
and
POST /cats for adding new cats, see src/cats/dto/create-cat.dto.ts for the format of a new cat