probably a way to get custom object definitions into this project
Now that you’ve created a Salesforce DX project, what’s next? Here are some documentation resources to get you started.
Do you want to deploy a set of changes, or create a self-contained application? Choose a development model.
The sfdx-project.json file contains useful configuration information for your project. See Salesforce DX Project Configuration in the Salesforce DX Developer Guide for details about this file.