Added task service (#374)

* Added task service

src/Microsoft.SqlTools.ServiceLayer/TaskServices/Contracts/TaskInfo.cs

@@ -1,21 +1,43 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
 
 namespace Microsoft.SqlTools.ServiceLayer.TaskServices.Contracts
 {
-    public enum TaskState
-    {
-        NotStarted = 0,
-        Running = 1,
-        Complete = 2
-    }
-
     public class TaskInfo
     {
-        public int TaskId { get; set;  }
+        /// <summary>
+        /// An id to unify the task
+        /// </summary>
+        public string TaskId { get; set;  }
+
+        /// <summary>
+        /// Task status
+        /// </summary>
+        public SqlTaskStatus Status { get;  set; }
+
+        /// <summary>
+        /// Database server name this task is created for
+        /// </summary>
+        public string ServerName { get; set; }
+
+        /// <summary>
+        /// Database name this task is created for
+        /// </summary>
+        public string DatabaseName { get; set; }
+
+
+        /// <summary>
+        /// Task name which defines the type of the task (e.g. CreateDatabase, Backup)
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Task description
+        /// </summary>
+        public string Description { get; set; }
 
-        public TaskState State { get;  set; }
     }
 }