Added writing an operating system in Nim

README.md

@@ -272,6 +272,7 @@ It's a great way to learn.
 * [**C**: _Operating systems development for Dummies_](https://medium.com/@lduck11007/operating-systems-development-for-dummies-3d4d786e8ac)
 * [**C++**: _Write your own Operating System_](https://www.youtube.com/playlist?list=PLHh55M_Kq4OApWScZyPl5HhgsTJS9MZ6M) [video]
 * [**C++**: _Writing a Bootloader_](http://3zanders.co.uk/2017/10/13/writing-a-bootloader/)
+* [**Nim**: Fusion OS: Writing an OS in Nim](https://0xc0ffee.netlify.app/osdev/)
 * [**Rust**: _Writing an OS in Rust_](https://os.phil-opp.com/)
 * [**Rust**: _Add RISC-V Rust Operating System Tutorial_](https://osblog.stephenmarz.com/)
 * [**(any)**: _Linux from scratch_](https://linuxfromscratch.org/lfs)