Add just and justfile

flake.nix

@@ -18,7 +18,9 @@
       in
       {
         devShells.default = pkgs.mkShell {
-          buildInputs = [];
+          buildInputs = with pkgs; [
+            just
+          ];
           shellHook = "";
         };
       }

justfile

@@ -0,0 +1,13 @@
+# The default command to run when ran with just 'just'
+[group('General')]
+default: help
+
+# Print the available commands
+[group('General')]
+help:
+    @just --list
+
+# Update project dependencies
+[group('General')]
+update:
+    nix flake update