chore: add nix flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1693145325,
+        "narHash": "sha256-Gat9xskErH1zOcLjYMhSDBo0JTBZKfGS0xJlIRnj6Rc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cddebdb60de376c1bdb7a4e6ee3d98355453fe56",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,19 @@
+{
+  description = "Icons for the COSMIC desktop environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = { self, nixpkgs }: {
+    packages.x86_64-linux.default =
+      with import nixpkgs { system = "x86_64-linux"; };
+      stdenv.mkDerivation {
+        nativeBuildInputs = [ just ];
+        name = "cosmic-icons";
+        src = self;
+        installPhase = "just prefix=$out install";
+      };
+
+  };  
+}