Describe package features in readme

[coatesap]

There is a good description of some of the features this package provides at https://cristianllanos.medium.com/eloquent-models-from-my-database-5d74c632e03c#.qg7cd4vri, but it would be good to include some of this in the readme, so that developers who arrive at the repo can quickly understand what it does, and what features make it stand out from the alternatives.