Add requirement for DirectX to be installed to readme

[k0pp0]

Describe the feature you'd like to see added

just a pointer - on a fresh windows 11 build I had to download DirectX runtimes on top of the VC redistributables.

here's the link: https://download.microsoft.com/download/1/7/1/1718CCC4-6315-4D8E-9543-8E28A4E18C4C/dxwebsetup.exe

[Outrunner24]

Well...Duh, it's basically an unwritten rule for all Windows games, especially the older ones 😉

[k0pp0]

Yep, its unwritten, so helping people who don't know is the plan..