[Feature Request] Automatically setup services on existing projects

[markus-mohemian]

It would be super handy, especially for new developers on a project to automatically setup related services for a new site.
Whenever working on an existing project several steps are necessary to get the local dev environment up and running. Usually this involves starting docker images for database, caching and/or creating a site via Herd and adding the required services manually.

It would improve developer experience by a lot if this initial setup could be made faster.

Imagine following workflow:

1. You clone the project to you computer
2. You add a new Site to Herd
3. Herd automatically adds the projects required services and populates the .env file for you

I know there are definitely cases that need to be considered, like where to read the services from (.env.example maybe?) or what to do when the .env file already exists.