Setup standard src, test folder structure. Add unit test project.

src/ServiceHost/LanguageServer/Initialize.cs

@@ -0,0 +1,46 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.EditorServices.Protocol.MessageProtocol;
+
+namespace Microsoft.SqlTools.EditorServices.Protocol.LanguageServer
+{
+    public class InitializeRequest
+    {
+        public static readonly
+            RequestType<InitializeRequest, InitializeResult> Type =
+            RequestType<InitializeRequest, InitializeResult>.Create("initialize");
+
+        /// <summary>
+        /// Gets or sets the root path of the editor's open workspace.
+        /// If null it is assumed that a file was opened without having
+        /// a workspace open.
+        /// </summary>
+        public string RootPath { get; set; }
+
+        /// <summary>
+        /// Gets or sets the capabilities provided by the client (editor).
+        /// </summary>
+        public ClientCapabilities Capabilities { get; set; }
+    }
+
+    public class InitializeResult
+    {
+        /// <summary>
+        /// Gets or sets the capabilities provided by the language server.
+        /// </summary>
+        public ServerCapabilities Capabilities { get; set; }
+    }
+
+    public class InitializeError
+    {
+        /// <summary>
+        /// Gets or sets a boolean indicating whether the client should retry
+        /// sending the Initialize request after showing the error to the user.
+        /// </summary>
+        public bool Retry { get; set;}
+    }
+}
+