enhancement: add windows support

[SuperPuiu]

Hello,

I was working on one of my projects which happens to support both Linux and Windows and I wanted to make use of this library to add rich presence to Discord. However, I noticed that the library lacks support for Windows. I was wondering if it's possible that you could add support for the aforementioned platform. I'm offering to help, if needed.

[XielQs]

Hey, thanks a lot for the issue and for offering to help, really appreciate it!!

Honestly, dealing with C on Windows is a real pain in the ass, so I haven’t had much motivation to work on that part lately. On top of that, I haven’t written many libraries in C before, so I’m not entirely sure how to properly structure things for cross-platform support yet.

That said, I’m totally open to contributions and happy to support anyone who wants to tackle it. If you have any ideas or suggestions on how to organize things cleanly, I’m all ears!!

[SuperPuiu]

Alright, thank you for your fast response!