Missing username and password in readme

[nicgirault]

The configuration is incomplete in the readme

[roboflank]

@nicgirault any idea on how to add them in the datasources.json ?

[jdrouet]

@denzelwamburu @nicgirault just use {"url": "my connection string"} instead of parameters ;)

[roboflank]

@jdrouet Thanks :) Let me try, though am running into an another error https://github.com/jdrouet/loopback-component-storage-mongo/issues/8