Add Step-By-Step Command Line Promo Mode

[bshikin]

Current way to launch the script is run this command line prompt:

OPENAI_API_KEY=<your_openai_api_key>  ./launch.sh <config_name> <source_project_dir> <destination_project_dir>

We should add a mode where if it is launched without any parameters it goes into CLA question/answer mode:

$ ./launch.sh
Welcome to Unifree! 
Please answer a few questions to start the migration.
What is your OpenAPI key? <... user input ...>

Full path of the source Unity project: <... user input ...>

What language would you like to translate it to?
    [1] godot
    [2] unreal
<... user input ...>

Full path of the destination {CONFIG_NAME} project: <... user input ...>

... output of the script ...

[extrail]

I implemented a basic wizard and made some progress on a Linux/mac.
If you can add some comments regarding changes I would appreciate it :)
#17