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;
+}

Models/DrawingPoints.cs

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+using System.Collections.ObjectModel;
+using Avalonia;
+using Avalonia.Media;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace SimpleDraw.Models;
+
+public class DrawingPoints : ObservableObject
+{
+    private ObservableCollection<Point> _drawingPoints = new ObservableCollection<Point>();
+    // private ObservableCollection<ObservableCollection<Point>> _drawingPointsList = new ObservableCollection<ObservableCollection<Point>>();
+
+    private Brush _brush;
+    private double _brushThickness;
+    
+    public Brush Brush
+    {
+        get => _brush;
+        set => SetProperty(ref _brush, value);
+    }
+    
+    public double BrushThickness
+    {
+        get => _brushThickness;
+        set => SetProperty(ref _brushThickness, value);
+    }
+    
+    public ObservableCollection<Point> CurrentDrawingPoints
+    {
+        get => _drawingPoints;
+        set => SetProperty(ref _drawingPoints, value);
+    }
+
+    public DrawingPoints(Brush brush, double brushThickness)
+    {
+        Brush = brush;
+        BrushThickness = brushThickness;
+    }
+    
+    /*
+    public ObservableCollection<ObservableCollection<Point>> DrawingPointsList
+    {
+        get => _drawingPointsList;
+        set => SetProperty(ref _drawingPointsList, value);
+    }
+    */
+}