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.

[IgorArnaut]

{
  "development": {
    "database": "dev.db",
    "dialect": "sqlite"
  },
  "test": {
    "database": "test.db"
    "dialect": "sqlite"
  },
  "production": {
    "database": "prod.db",
    "dialect": "sqlite"
  }
}

I've configured Sequelize myself, but no .sqlite3 files were created.

[IgorArnaut]

I've created dev.db with sqlite3. But when I try migrating to the database, nothing has changed in dev.db file. So much for this project.