added simple ui

Scenes/SettingsController.cs

@@ -0,0 +1,30 @@
+using Godot;
+
+public partial class SettingsController : VBoxContainer
+{
+	private Main main;
+	private Slider slSize;
+	private Slider slRain;
+
+	// Called when the node enters the scene tree for the first time.
+	public override void _Ready()
+	{
+		main = GetNode<Main>("/root/Main");
+		slSize = GetNode<Slider>("brushSettings/slSize");
+		slRain = GetNode<Slider>("weatherSettings/slRain");
+
+		slSize.ValueChanged += OnSizeValueChanged;
+		OnSizeValueChanged(main.BrushSize);
+
+		slRain.ValueChanged += OnRainValueChanged;
+		OnRainValueChanged(main.RainAmount);
+	}
+
+	private void OnSizeValueChanged(double value) {
+		main.BrushSize = (int)value;
+	}
+
+	private void OnRainValueChanged(double value) {
+		main.RainAmount = (float)value;
+	}
+}