Do you know why sharp is added to the end of programming languages? Like c sharp and f sharp?

There was (and still is) a language called C. Then C++ was invented. And then C#, maybe because # looks kinda like 4 pluses.

There is also another programming paradigm, called functional programming. F# is a functional programming language and runs on the same platform as C# (that platform is called .NET). That's why they named it F#.

Actually, I don't even know if it is pronounced c sharp or f sharp. I just assumed it was the same as music.

Yes, it's pronounced see sharp.