added falling sand - dirt actually

Scripts/Elements/Dirt.cs

@@ -3,7 +3,18 @@
 namespace FOU.Scripts.Elements;
 
 public class Dirt : Solid {
-    public Dirt() {
+
+    public Dirt(int x, int y, ref Level level) : base(x, y, ref level) {
         Color = Colors.Brown;
     }
+
+    public override bool Update(int currentFrame) {
+        if (!base.Update(currentFrame)) return false;
+
+        if (CheckBelow(X, Y)) {
+            _level.Swap(this, X, Y+1);
+        }
+        return true;
+    }
+
 }