This is great, it looks like it does a lot already and I really like the plugin system. I think you should definitely get the documentation written up.
One thing, the "Walkthrough" video in your README is unwatchable, because it displays very small. I had to download it to be able to watch it properly.
[1] https://github.com/Wulf/create-rust-app
[2] https://www.shuttle.rs/blog/2021/10/08/building-a-startup-wi...