better menu

MainMenu/MenuBackground.cs

@@ -22,14 +22,25 @@ public class MenuBackground : Node2D
             int addCount = nParticles - currentCount;
             for (int i = 0; i < addCount; i++)
             {
-                
+                CreateParticle();
             }
         }
+        // TODO pick random particles to delete
     }
-    
-    //TODO add private method to add particles
-    
-    public override void _Process(float delta)
+
+    private void CreateParticle()
+    {
+        var particlePackedScene = GD.Load<PackedScene>("res://ParticleSimulation/ParticleNode.tscn");
+        var particleNode = particlePackedScene.Instance<ParticleNode>();
+        _particleNodes.AddChild(particleNode);
+        var screenSize = GetViewportRect().Size;
+        var position = new Vector2(
+            (float) GD.RandRange(0, screenSize.x),
+            (float) GD.RandRange(0, screenSize.y));
+        particleNode.Position = position;
+    }
+
+        public override void _Process(float delta)
     {
         //var particleNodesArray = _particleNodes.GetChildren();
         //foreach (ParticleNode particle in particleNodesArray)