Describe the feature you'd like to request

Scenario:
Uninstall yarn completely from the system, and run

npx create-turbo@latest yourapp

It will fail at the second step where it should install the packages via yarn. Because yarn isn't there.

And it gives an unhelpful error:

Installing dependencies...
  Aborting installation.
    yarn install has failed.

Describe the solution you'd like

Instead of giving that error, there can be 3 approaches:

1. Tell the user exactly that yarn isn't found on their system, so either set up the project using npm. Just make it like: Press Y to setup with npm instead, or they can quit and restart with npm.
2. the Second approach would be to say: Command yarn not found. Press 1 to install it, or press 2 to set up with npm instead.
3. Third way would be to simply install yarn automatically. Just put a message saying Installing yarn...

Describe alternatives you've considered

The alternative is to understand why yarn install would fail, which could be because of many reasons I guess. Then figure out that you don't have yarn installed, so install it first, then go back to the Turborepo setup.