assignment: added an example package

src/skynet/nix.md

@@ -23,6 +23,18 @@ This means that multiple versions of the program (some even the same version but
 An example using different versions of Firefox:  
 ![img.png](nix/firefox_co-existing.png)
 
+##### Example
+An example of packaging an application can be found here:  
+[Sieve Editor GUI on Nixpkgs][nix_pkgs_sieve]
+
+This is packaging up a GUI node.js application.  
+The application itself allows the user to edit sieve scripts.  
+Once you have [downloaded and installed](#download) Nix you will be able to install and run it like so:  
+```shell
+nix-shell -p sieve-editor-gui
+sieve-editor-gui .
+```
+
 #### Language
 There are two partially difficult problems in computer science:
 1. Off by one errors
@@ -80,6 +92,7 @@ For more detailed information I recommend these resources.
 * [Nix Pills][nix_guide_pills]
 
 ### Flakes
+            
 
 ### Nixos
 
@@ -109,4 +122,5 @@ For more detailed information I recommend these resources.
 [nixos_skynet]: https://forgejo.skynet.ie/Skynet/nixos
 [nix_paper]: https://edolstra.github.io/pubs/nspfssd-lisa2004-final.pdf
 [nix_guide_official]: https://nix.dev/tutorials/first-steps/
-[nix_guide_pills]: https://nixos.org/guides/nix-pills/#
+[nix_guide_pills]: https://nixos.org/guides/nix-pills/#
+[nix_pkgs_sieve]: https://github.com/NixOS/nixpkgs/blob/a3c0b3b21515f74fd2665903d4ce6bc4dc81c77c/pkgs/by-name/si/sieve-editor-gui/package.nix