Add project files.

TomatenMusic Api/Auth/Entities/User.cs

@@ -0,0 +1,14 @@
+namespace TomatenMusic_Api.Auth.Entities;
+
+using System.Text.Json.Serialization;
+
+public class User
+{
+    public int Id { get; set; }
+    public string FirstName { get; set; }
+    public string LastName { get; set; }
+    public string Username { get; set; }
+
+    [JsonIgnore]
+    public string Password { get; set; }
+}