Add realtime info

[Ahaeflig]

Hi, I came across your list, thanks for sharing it.

I thought it would be useful if the table included information about whether each model can run in realtime or not and with what hardware. I might do a PR if I find the time.

Best, H. A

[Pendrokar]

By realtime, you mean audio generation is close to real time or has audio streaming support?

[acidbubbles]

I think the intention is to identify their "speed". This is very useful information but hard to clearly define :)

[Pendrokar]

Indeed. As it depends on hardware. If a TTS supports audio streaming, that is would be more easily defined.

[Vaibhavs10]

Closing in favor of https://github.com/Vaibhavs10/open-tts-tracker/issues/14