Hey, no problem! It also took me a little bit of time to find my way around the Git repo too.
I personally didn’t use vue-cli
while working with Vue3. I was able to run it by just cloning the repo and then running npm install
Actually, I wrote a little startup guide on my experience working with the Vue3 Alpha demo provided by Evan You, so if you are interested in looking more into that — here’s a link.