This extension is not maintained as part of the Entity Framework Core project. When considering a third party extension, be sure to evaluate quality, licensing, support, etc. to ensure they meet your requirements.
LLBLGen Pro is an entity modeling solution with support for Entity Framework and Entity Framework Core. It lets you easily define your entity model and map it to your database, using database first or model first, so you can get started writing queries right away.
The following resources will help you get started with LLBLGen Pro.