feat: initial datamodel + ef connection and migrations

Initial version of the data model
Includes EF initialization and migrations
EF migrations are applied on application start

TournamentOrganizer/Models/Game.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace TournamentOrganizer.Models;
+
+public enum RuleSet
+{
+    DoubleElimination,
+    SingleElimination,
+    RoundRobin,
+    Swiss
+}
+
+public class Game
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+    public string Name { get; set; } = "Example Game";
+    public string Description { get; set; } = "Example Game Description";
+
+    public RuleSet S1RuleSet { get; set; }
+    public int S1Groups;
+    public int S1GroupAdvances;
+
+    public RuleSet? S2RuleSet { get; set; }
+
+    public required List<Tournament> Tournaments { get; set; }
+
+}