README.md: list required build dependencies on Debian and derivatives

[VThang51]

Add command to install dependencies

[oSoMoN]

These commands are specific to Debian and its derivatives. It would be helpful to make that explicit, and perhaps to provide the counterparts for other popular distros, including ArchLinux and Fedora.

[VThang51]

These commands are specific to Debian and its derivatives. It would be helpful to make that explicit, and perhaps to provide the counterparts for other popular distros, including ArchLinux and Fedora.

I thought so from beginning, but I dont use those two thing, so I hope someone will add them. I dont want to use AI because I dont trust it much

[oSoMoN]

I thought so from beginning, but I dont use those two thing, so I hope someone will add them. I dont want to use AI because I dont trust it much

That's fine, but can you please make it explicit that these commands are Debian (and its derivatives) specific?

[oSoMoN]

Verified that these deps are sufficient to build gamescope in a pristine ubuntu 26.04 container.