Add project files.

PracticeCalendar.Domain/Entities/Attendee.cs

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+using Ardalis.GuardClauses;
+using PracticeCalendar.Domain.Common;
+using System.Diagnostics.Contracts;
+
+namespace PracticeCalendar.Domain.Entities
+{
+    /// <summary>
+    /// Attendee to an event
+    /// </summary>
+    public class Attendee: EntityBase
+    {
+        public Attendee(string name, string emailAddress)
+        {
+            Guard.Against.NullOrEmpty(name);
+            Guard.Against.NullOrEmpty(emailAddress);
+            Name = name;
+            EmailAddress = emailAddress;
+        }
+
+        public int PracticeEventId { get; private set; }
+        public string Name { get; set; } = string.Empty;
+        public string EmailAddress { get; set; } = string.Empty;
+        public bool IsAttending { get; private set; }
+        
+        /// <summary>
+        /// Set if the Attendee is attending
+        /// </summary>
+        /// <param name="isAttending"></param>
+        public void SetIsAttending (bool isAttending)
+        {
+            this.IsAttending = isAttending;
+            //TODO - raise event
+        }
+
+        /// <summary>
+        /// Assign Attendee to the practice event
+        /// </summary>
+        /// <param name="practiceEventId"></param>
+        public void AssignToEvent(int practiceEventId)
+        {
+            this.PracticeEventId = practiceEventId;
+        }
+    }
+}