Added further base classes

src/SharedNetCoreLibrary/Enums/ContactType.cs

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+namespace AndreasReitberger.Shared.Core.Enums
+{
+    public enum ContactType
+    {
+        Phone,
+        Mobile,
+        Email,
+        Fax,
+    }
+}

src/SharedNetCoreLibrary/Interfaces/IAddress.cs

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+namespace AndreasReitberger.Shared.Core.Interfaces
+{
+    public interface IAddress
+    {
+        #region Properties
+
+        public string Street { get; set; }
+        public string HouseNumber { get; set; }
+        public string ZipCode { get; set; }
+        public string City { get; set; }
+        public string State { get; set; }
+        public string Country { get; set; }
+
+        #endregion
+    }
+}

src/SharedNetCoreLibrary/Interfaces/IContactDetail.cs

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+using AndreasReitberger.Shared.Core.Enums;
+
+namespace AndreasReitberger.Shared.Core.Interfaces
+{
+    public interface IContactDetail
+    {
+        #region Properties
+
+        public ContactType Type { get; set; }
+        public string Value { get; set; }
+
+        #endregion
+    }
+}

src/SharedNetCoreLibrary/Interfaces/IPerson.cs

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+namespace AndreasReitberger.Shared.Core.Interfaces
+{
+    public interface IPerson
+    {
+        #region Properties
+
+        public string Salutation { get; set; }
+        public string FirstName { get; set; }
+        public string LastName { get; set; }
+        public IAddress? Address { get; set; }
+        public ICollection<IContactDetail> ContactDetails { get; set; }
+
+        #endregion
+    }
+}

src/SharedNetCoreLibrary/Models/Address/Address.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using AndreasReitberger.Shared.Core.Interfaces;
+
+namespace AndreasReitberger.Shared.Core.Models.Adress
+{
+    public partial class Address : ObservableObject, IAddress
+    {
+        #region Properties
+        [ObservableProperty]
+        public partial string Street { get; set; }  
+
+        [ObservableProperty]
+        public partial string HouseNumber { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial string ZipCode { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial string City { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial string State { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial string Country { get; set; } = string.Empty;
+        #endregion
+    }
+}

src/SharedNetCoreLibrary/Models/Person/ContactDetail.cs

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+using AndreasReitberger.Shared.Core.Enums;
+using AndreasReitberger.Shared.Core.Interfaces;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace AndreasReitberger.Shared.Core.Person
+{
+    public partial class ContactDetail : ObservableObject, IContactDetail
+    {
+        #region Properties
+
+        [ObservableProperty]
+        public partial ContactType Type { get; set; }
+
+        [ObservableProperty]
+        public partial string Value { get; set; } = string.Empty;
+        #endregion
+    }
+}

src/SharedNetCoreLibrary/Models/Person/Person.cs

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+using AndreasReitberger.Shared.Core.Interfaces;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace AndreasReitberger.Shared.Core.Person
+{
+    public partial class Person : ObservableObject, IPerson
+    {
+        #region Properties
+        [ObservableProperty]
+        public partial string Salutation { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial string FirstName { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial string LastName { get; set; } = string.Empty;
+
+        [ObservableProperty]
+        public partial IAddress? Address { get; set; }
+
+        [ObservableProperty]
+        public partial ICollection<IContactDetail> ContactDetails { get; set; } = [];
+        #endregion
+    }
+}