Add AbstractMessageType base class for request types

Author: Kapil Borle

src/PowerShellEditorServices.Protocol/MessageProtocol/AbstractMessageType.cs

@@ -0,0 +1,35 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol
+{
+    /// <summary>
+    /// Defines an event type with a particular method name.
+    /// </summary>
+    /// <typeparam name="TParams">The parameter type for this event.</typeparam>
+    public class AbstractMessageType
+    {
+        private string _method;
+        private int _numberOfParams;
+
+        /// <summary>
+        /// Gets the method name for the event type.
+        /// </summary>
+        public string Method { get { return _method; } }
+
+        /// <summary>
+        /// Gets the number of parameters.
+        /// </summary>
+        public int NumberOfParams { get; }
+
+        public AbstractMessageType(string method, int numberOfParams)
+        {
+            _method = method;
+            _numberOfParams = numberOfParams;
+        }
+    }
+}
+
+