chore: comments for event struct

Runtime/Event.cs

@@ -1,13 +1,24 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 
 namespace SkyHook
 {
   [StructLayout(LayoutKind.Sequential)]
+  [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
   public struct SkyHookEvent
   {
-    public ulong Time;
-    public short Type;
-    public uint Key;
+    /// <summary>
+    /// When the key was pressed
+    /// </summary>
+    public readonly ulong Time;
+    /// <summary>
+    /// The key is pressed or released
+    /// </summary>
+    public readonly EventType Type;
+    /// <summary>
+    /// The key number that was pressed or released
+    /// </summary>
+    public readonly uint Key;
   }
 
   public enum EventType