Revert "Drop files from .gitignore"

This reverts commit 84ad43af76.

api/Domain/Person.cs

@@ -8,34 +8,4 @@ public sealed class Person
 
     public DateOnly Birthday { get; }
 
-    private Person(String username, String realName, DateOnly birthday)
-    {
-        Username = username;
-        RealName = realName;
-        Birthday = birthday;
-    }
-
-    public static Person Create(String username, String realName, DateOnly birthday)
-    {
-        username = NormalizeUsername(username);
-        realName = realName.Trim();
-        
-        // TODO: Error Handling
-        if (username.Length is < 3 or > 32) throw new Exception();
-        if (realName.Length == 0) throw new Exception();
-        if (birthday >= DateOnly.FromDateTime(DateTime.Today)) throw new Exception();
-        if (!IsAtLeast16(birthday)) throw new Exception();
-
-        return new Person(username, realName, birthday);
-    }
-
-    // Konstruktor zum Erzeugen von Nutzerobjekten aus der Datenbank
-    internal static Person FromStorage(String username, String realName, DateOnly birthday)
-        => new(username, realName, birthday);
-
-    public static String NormalizeUsername(String username)
-        => username.Trim().ToLowerInvariant();
-
-    public static bool IsAtLeast16(DateOnly birthday)
-        => birthday.AddYears(16) <= DateOnly.FromDateTime(DateTime.Today);
 }