Merge ServiceHost xUnit test project into dev. (#5)

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

* Actually stage the deletes.  Update .gitignore

src/ServiceHost/Program.cs

@@ -0,0 +1,40 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+using System;
+using Microsoft.SqlTools.EditorServices.Protocol.Server;
+using Microsoft.SqlTools.EditorServices.Session;
+using Microsoft.SqlTools.EditorServices.Utility;
+
+namespace Microsoft.SqlTools.ServiceHost
+{     
+    /// <summary>
+    /// Main application class for SQL Tools API Service Host executable
+    /// </summary>
+    class Program
+    {
+        /// <summary>
+        /// Main entry point into the SQL Tools API Service Host
+        /// </summary>
+        static void Main(string[] args)
+        {
+            // turn on Verbose logging during early development
+            // we need to switch to Normal when preparing for public preview
+            Logger.Initialize(minimumLogLevel: LogLevel.Verbose);
+            Logger.Write(LogLevel.Normal, "Starting SQL Tools Service Host");
+
+            const string hostName = "SQL Tools Service Host";
+            const string hostProfileId = "SQLToolsService";
+            Version hostVersion = new Version(1,0);
+
+            // set up the host details and profile paths 
+            var hostDetails = new HostDetails(hostName, hostProfileId, hostVersion);     
+            var profilePaths = new ProfilePaths(hostProfileId, "baseAllUsersPath", "baseCurrentUserPath");
+
+            // create and run the language server
+            var languageServer = new LanguageServer(hostDetails, profilePaths);            
+            languageServer.Start().Wait();            
+            languageServer.WaitForExit();
+        }
+    }
+}