Your wish is my command. 
Added to the to-do list for v7
Initial thinking is that there will be a new but optional file in the <uibRoot>/.config/ folder, called something like projectPackage.json. It would be, I think a sub-set of a standard package.json A full package.json on 2nd thoughts so that it would be easy to copy/paste your current <uibRoot>/package.json. That will let you include a default version, description, etc if you wish along-side the dependencies.
I will attempt to also trap a new project create to run the install if I can. Otherwise, it will display a notification for the user to run that manually. Not certain whether Node-RED will have to be restarted, I will try to avoid that but it might not be possible. Will have to test.
