Added install instructions for NixOS (#355)

Added instructions to install figma-linux in the most straight-forward and simple way. Tested the instructions myself on my machine running Linux Nixos 6.1.63
Figma-Linux · Dec 23, 2023 · d76693e · d76693e
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diff --git a/README.md b/README.md
@@ -110,6 +110,11 @@ Download the .rpm package from our [Releases](https://github.com/Figma-Linux/fig
 sudo dnf install figma-linux-*.x86_64.rpm
 ```
 
+### Nixos
+On Nixos, you may add `figma-linux` in the `environment.systemPackages` list of your `/etc/nixos/configuration.nix` and run:
+```bash
+sudo nixos-rebuild switch
+```
 
 ## Building from source