You need framework7-cli to be installed globally to your PC https://framework7.io/cli/installation.html
First of all make sure you have latest stable Node.js and NPM installed on your machine.
If you are going to target Native/Hybrid apps then you also need to install Cordova first (may require
Now we can install Framework7 CLI (may require
If you have issues with installation related to access errors, you may try to run the command with additional flags: