Fixing issues as per suggestions from @kevcunnane

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionMessages.cs

@@ -0,0 +1,63 @@
+//
+// 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.ServiceLayer.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
+{
+    /// <summary>
+    /// Message format for the initial connection request
+    /// </summary>
+    public class ConnectionDetails
+    {
+        /// <summary>
+        /// Gets or sets the connection server name
+        /// </summary>
+        public string ServerName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the connection database name
+        /// </summary>
+        public string DatabaseName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the connection user name
+        /// </summary>
+        public string UserName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the connection password
+        /// </summary>
+        /// <returns></returns>
+        public string Password { get; set; }
+    }
+
+    /// <summary>
+    /// Message format for the connection result response
+    /// </summary>
+    public class ConnectionResult
+    {
+        /// <summary>
+        /// Gets or sets the connection id
+        /// </summary>
+        public int ConnectionId { get; set; }
+
+        /// <summary>
+        /// Gets or sets any connection error messages
+        /// </summary>
+        public string Messages { get; set; }
+    }
+
+    /// <summary>
+    /// Connect request mapping entry 
+    /// </summary>
+    public class ConnectionRequest
+    {
+        public static readonly
+            RequestType<ConnectionDetails, ConnectionResult> Type =
+            RequestType<ConnectionDetails, ConnectionResult>.Create("connection/connect");
+    }
+
+}