Initial code commit.

Sufi.Demo.PeopleDirectory.Domain/Common/AuditableEntity.cs

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+using System;
+
+namespace Sufi.Demo.PeopleDirectory.Domain.Common
+{
+	public abstract class AuditableEntity<TId> : IAuditableEntity<TId>
+	{
+		public TId Id { get; set; } = default!;
+		public string? CreatedBy { get; set; }
+		public DateTime CreatedOn { get; set; }
+		public string? LastModifiedBy { get; set; }
+		public DateTime? LastModifiedOn { get; set; }
+	}
+}

Sufi.Demo.PeopleDirectory.Domain/Common/IAuditableEntity.cs

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+using System;
+
+namespace Sufi.Demo.PeopleDirectory.Domain.Common
+{
+	public interface IAuditableEntity<TId> : IAuditableEntity, IEntity<TId>
+	{
+
+	}
+
+	public interface IAuditableEntity : IEntity
+	{
+		string? CreatedBy { get; set; }
+		DateTime CreatedOn { get; set; }
+		string? LastModifiedBy { get; set; }
+		DateTime? LastModifiedOn { get; set; }
+	}
+}

Sufi.Demo.PeopleDirectory.Domain/Common/IEntity.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Sufi.Demo.PeopleDirectory.Domain.Common
+{
+	public interface IEntity
+	{
+	}
+
+	public interface IEntity<TId> : IEntity 
+	{
+		[Key]
+		TId Id { get; set; }
+	}
+}

Sufi.Demo.PeopleDirectory.Domain/Entities/Misc/Contact.cs

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+using Sufi.Demo.PeopleDirectory.Domain.Common;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Sufi.Demo.PeopleDirectory.Domain.Entities.Misc
+{
+	public class Contact : AuditableEntity<int>
+	{
+		[Required]
+		[Column(TypeName = "character varying(50)")]
+		public string UserName { get; set; } = null!;
+		[Required]
+		[Phone]
+		[Column(TypeName = "character varying(20)")]
+		public string Phone { get; set; } = null!;
+		[Required]
+		[EmailAddress]
+		[Column(TypeName = "character varying(100)")]
+		public string Email { get; set; } = null!;
+		[Required]
+		[Column(TypeName = "character varying(255)")]
+		public string SkillSets { get; set; } = null!;
+		[Required]
+		[Column(TypeName = "character varying(255)")]
+		public string Hobby { get; set; } = null!;
+	}
+}

Sufi.Demo.PeopleDirectory.Domain/Entities/Misc/ServerInfo.cs

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+using Sufi.Demo.PeopleDirectory.Domain.Common;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Sufi.Demo.PeopleDirectory.Domain.Entities.Misc
+{
+	public class ServerInfo : AuditableEntity<string>
+	{
+		[Required]
+		[Column(TypeName = "character varying(255)")]
+		public string Value { get; set; } = null!;
+	}
+}

Sufi.Demo.PeopleDirectory.Domain/Sufi.Demo.PeopleDirectory.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  
+</Project>