Add macOS to README.md

[UltraHDR]

No description provided.

[Exzap]

There should be a disclaimer of sorts that informs users that the macOS build is still pretty experimental and has known issues. Maybe with a link to https://cemu.emiyl.com/

[UltraHDR]

Thanks @Exzap . Do you think you, @Tillsunset or @emiyl can create a "State of macOS" issue similar to #107 and track all the known issues such as:

• Copied from https://cemu.emiyl.com/installation

Flickering or invisible textures: In some games, such as Mario Kart 8 and Bayonetta 2, some textures appear to flicker or not appear. This can be fixed by setting the environment variable MVK_CONFIG_FAST_MATH_ENABLED=0 in exchange for a 5-10% performance hit.

Pipeline failure: Cemu can sometimes fail to create or compile a pipeine cache when using MoltenVK. The best solution to this currently is to delete your existing shader cache, by right-clicking on the title in Cemu and clicking "Remove shader caches".

No sound: By default, Cemu on macOS sets audio output to 0%, with no audio device set. Go into the audio settings, select an audio device, and turn up the volume.

• Cemu2.0-19 Twilight Princess HD map bug #569

Thanks

[Exzap]

I don't use macOS personally so I don't feel comfortable with making a "State of macOS" issue but I'll ask around.

[emiyl]

I'd be happy to write some stuff up when I have some free time