Prompt user if insufficient args

[lukeed]

If not enough data has been passed to the preact create command, should we prompt the user for the data?

Currently, Yargs will exit and print help text along with ~Not enough non-option arguments: got 0, need at least 2.

If we were to prompt users for missing data, we'd also print an info message along these lines:

warn('Insufficient command arguments! Prompting...');
info('Alternatively, run `preact create --help` for usage info.');

What should we do?

PS: If we do want to prompt, I have this completed in a local branch.

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Extracted from #329 for clarity.