groundlaying functionality

Models/ColorPickerButton.cs

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+using System.Collections.Generic;
+using System.ComponentModel;
+using Avalonia.Media;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace SimpleDraw.Models;
+
+public class ColorPickerButton : ObservableObject
+{
+    private SolidColorBrush _color;
+    public RelayCommand SelectColorCommand { get; set; }
+
+    public SolidColorBrush Color
+    {
+        get => _color;
+        set => _color = value;
+    }
+    
+    // public event PropertyChangedEventHandler? PropertyChanged;
+}