Added Issue Events client interface and corresponding types

Octokit/Models/Response/EventInfo.cs

@@ -0,0 +1,69 @@
+using System;
+
+namespace Octokit
+{
+    public class EventInfo
+    {
+        public Uri Url { get; set; }
+
+        /// <summary>
+        /// Always the User that generated the event
+        /// </summary>
+        public Actor Actor { get; set; }
+
+        /// <summary>
+        /// Identifies the actual type of Event that occurred
+        /// </summary>
+        public EventInfoState InfoState { get; set; }
+
+        /// <summary>
+        /// The String SHA of a commit that referenced this Issue
+        /// </summary>
+        public string CommitId { get; set; }
+
+        /// <summary>
+        /// Date the event occurred for the issue/pull request.
+        /// </summary>
+        public DateTimeOffset CreatedAt { get; set; }
+    }
+
+    public enum EventInfoState
+    {
+        /// <summary>
+        /// The issue was closed by the actor. When the commit_id is present, it identifies the commit that 
+        /// closed the issue using “closes / fixes #NN” syntax.
+        /// </summary>
+        Closed,
+
+        /// <summary>
+        /// The issue was reopened by the actor.
+        /// </summary>
+        Reopened,
+
+        /// <summary>
+        /// The actor subscribed to receive notifications for an issue.
+        /// </summary>
+        Subscribed,
+
+        /// <summary>
+        /// The issue was merged by the actor. The commit_id attribute is the SHA1 of the HEAD commit that was merged.
+        /// </summary>
+        Merged,
+
+        /// <summary>
+        /// The issue was referenced from a commit message. The commit_id attribute is the commit SHA1 of where 
+        /// that happened.
+        /// </summary>
+        Referenced,
+
+        /// <summary>
+        /// The actor was @mentioned in an issue body.
+        /// </summary>
+        Mentioned,
+
+        /// <summary>
+        /// The issue was assigned to the actor.
+        /// </summary>
+        Assigned
+    }
+}