Add Loopback 4 example?

[dougal83]

Could Loopback 4 example be added?

See: loopbackio/loopback-next#4421

[hacksparrow]

Yes, we should.

[dhmlau]

Cross posting comment from @jannyHou:

Another usage can be found in loopback4-shopping-example: https://github.com/strongloop/loopback4-example-shopping/blob/master/packages/shopping/src/repositories/shopping-cart.repository.ts
The shopping-cart repository is connected to a redis datasource.

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