Added ASP.NET backend with SQLite

backend/MuiCharts.Domain/Models/Track.cs

@@ -0,0 +1,36 @@
+using System.ComponentModel.DataAnnotations;
+using MuiCharts.Domain.Enums;
+
+namespace MuiCharts.Domain.Models;
+
+/// <summary>
+/// Represents a track with information about the first point ID, second point ID, distance, surface, and maximum speed.
+/// </summary>
+public class Track
+{
+	/// <summary>
+	/// Gets or sets the first ID.
+	/// </summary>
+	public required int FirstId { get; init; }
+
+	/// <summary>
+	/// Gets or sets the second ID.
+	/// </summary>
+	public required int SecondId { get; init; }
+
+	/// <summary>
+	/// Gets or sets the distance.
+	/// </summary>
+	[Range(1, int.MaxValue)]
+	public required int Distance { get; init; }
+
+	/// <summary>
+	/// Gets or sets the surface.
+	/// </summary>
+	public required Surface Surface { get; init; }
+
+	/// <summary>
+	/// Gets or sets the maximum speed.
+	/// </summary>
+	public required MaxSpeed MaxSpeed { get; init; }
+}