Add SDL2 to system packages
diff --git a/src/nix/system/sdl.nix b/src/nix/system/sdl.nix
new file mode 100644
index 0000000..e9090ab
--- /dev/null
+++ b/src/nix/system/sdl.nix
@@ -0,0 +1,10 @@
+{ pkgs, ... }: {
+    environment.systemPackages = with pkgs; [
+        SDL2
+        SDL2_ttf
+        SDL2_net
+        SDL2_sound
+        SDL2_mixer
+        SDL2_image
+    ];
+}