feat: Add Dark/Light color palette.

src/Semi.Avalonia.ColorPicker/SemiColorLightPalette.cs

@@ -0,0 +1,29 @@
+using Avalonia.Controls;
+using Avalonia.Media;
+using Avalonia.Utilities;
+
+namespace Semi.Avalonia.ColorPicker;
+
+public class SemiColorLightPalette: IColorPalette
+{
+    private static readonly Color[,] Colors = new Color[,]
+    {
+        {
+            Color.FromUInt32(0xFFFEF2ED),
+        },
+        {
+            Color.FromUInt32(0xFFFEF2ED),
+        }
+    };
+    public Color GetColor(int colorIndex, int shadeIndex)
+    {
+        return Colors[
+            MathUtilities.Clamp(colorIndex, 0, ColorCount - 1),
+            MathUtilities.Clamp(shadeIndex, 0, ShadeCount - 1)
+        ];
+    }
+
+    public int ColorCount => Colors.GetLength(0);
+
+    public int ShadeCount => Colors.GetLength(1);
+}