add credits to readme as well

README.MD

@@ -5,7 +5,7 @@
 ### Description
 Cross-platform installer for [Monika After Story](https://github.com/Monika-After-Story/MonikaModDev)
 
-### Main features:
+### Main Features:
 - Cross-platform (Windows, MacOS, Linux)
 - Small executables size
 - Fast
@@ -17,11 +17,14 @@ Cross-platform installer for [Monika After Story](https://github.com/Monika-Afte
 - - spritepacks (separated)
 - Music during installation
 
-### Main stack:
-- Rust 1.62
+### Music Credits:
+Installer theme by [MyNewSoundtrack](https://www.youtube.com/user/MyNewSoundtrack)
+
+### Main Stack:
+- Rust 1.62 (can build >= 1.59)
 - FLTK 1.3
 
-### Building from source:
+### Building from Source:
 - Building is straightforward using [`cargo`](https://github.com/rust-lang/cargo/)
 - - Linux: you might need to install some dependencies (check [this workflow](https://github.com/Monika-After-Story/mas-installer/blob/master/.github/workflows/build.yml) for more details)
 - - Windows: for now both `msvc` and `gnu` toolchains are supported, but `msvc` is more preferable