Working on users view, added infrastructure lib

UserService.Infrastructure/DataModels/Member.cs

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+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace UserService.Infrastructure.DataModels
+{
+    public abstract class Member : Node
+    {
+        [EmailAddress]
+        public string? EMail { get; set; }
+
+        public ICollection<UserMember> Members { get; set; } = new List<UserMember>();
+    }
+}

UserService.Infrastructure/DataModels/Node.cs

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+#nullable enable
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace UserService.Infrastructure.DataModels
+{
+    public abstract class Node : ICloneable
+    {
+        public int Id { get; set; }
+        [Required] public string CommonName { get; set; } = null!;
+        public string? Description { get; set; }
+        public ICollection<Node> Children { get; set; } = new List<Node>();
+        public Node? Parent { get; set; } //Parent
+        public int? ParentId { get; set; }
+
+        public override string ToString() => CommonName;
+
+        public int Level => Parent?.Level + 1 ?? 0;
+
+        /// <inheritdoc />
+        public virtual object Clone() => MemberwiseClone();
+    }
+}

UserService.Infrastructure/DataModels/OrganizationUnit.cs

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+namespace UserService.Infrastructure.DataModels
+{
+    public class OrganizationUnit : Node
+    {
+        public Member? Manager { get; set; }
+    }
+}

UserService.Infrastructure/DataModels/SecurityGroup.cs

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+namespace UserService.Infrastructure.DataModels
+{
+    public class SecurityGroup : Member
+    {
+    }
+}

UserService.Infrastructure/DataModels/User.cs

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+using System.Collections.Generic;
+
+namespace UserService.Infrastructure.DataModels
+{
+    public class User : Member
+    {
+        public string? FirstName { get; set; }
+        public string? LastName { get; set; }
+        public bool IsActive { get; set; }
+
+        public string FullName => $"{FirstName} {LastName}";
+
+        public IEnumerable<UserMember> MemberOf { get; set; } = new List<UserMember>();
+    }
+}

UserService.Infrastructure/DataModels/UserMember.cs

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+namespace UserService.Infrastructure.DataModels
+{
+    public class UserMember
+    {
+        public int MemberId { get; set; }
+        public Member? Member { get; set; }
+
+        public int UserId { get; set; }
+
+        public User? User { get; set; }
+    }
+}