Adding command-line options to ReadMe

[Ahmed-E-86]

Could you please add all available command-line options to README.md? It will make it easy to launch games with a script instead of using the GUI.

[wowitsjack]

Can do, homie.

I'll get right on it.

[Ahmed-E-86]

Can do, homie.

I'll get right on it.

I appreciate you, man. Thank you!