added Infrastructure

SurveyBackend/SurveyBackend.Core/Models/Group.cs

@@ -0,0 +1,9 @@
+namespace SurveyBackend.Core.Models;
+
+public class Group
+{
+    public int Id { get; set; }
+    public string Label { get; set; }
+
+    public ICollection<User> Users { get; set; }
+}

SurveyBackend/SurveyBackend.Core/Models/User.cs

@@ -6,6 +6,8 @@ public class User
     public string Username { get; set; }
     public string Email { get; set; }
 
-    public byte[] PasswordHash { get; set; }
     public byte[] PasswordSalt { get; set; }
+    public byte[] PasswordHash { get; set; }
+
+    public ICollection<Group> Groups { get; set; }
 }