Add option for dialects during project initialization

[IgorArnaut]

Can you please add option for dialects during project initialization? By default init command generates a project that uses MySQL. What if I want to use sqlite3? I'd have to configure it manually, but I don't know what to put exactly. I've put

{
    "development": {
        "dialect": "sqlite",
        "database": ":memory:"
    }
}

but I'm not sure if that's correct. I've searched the issues and couldn't find exactly what I want.