Porting showplan code from ssms (#1280)

* Porting showplan code from ssms

* Moving showplans bits to a subfolder

* code cleanup

* Remvoing unnecssary conditional visibility

src/Microsoft.SqlTools.ServiceLayer/ShowPlan/ShowPlanGraph/Description.cs

@@ -0,0 +1,88 @@
+//
+// 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.ShowPlan.ShowPlanGraph
+{
+    public class Description
+    {
+        #region Properties
+
+        public string Title
+        {
+            get { return this.title; }
+            set
+            {
+                this.title = value.Trim().Replace(NewLine, " ");
+            }
+        }
+
+        public string QueryText
+        {
+            get { return this.queryText; }
+            set
+            {
+                string text = value.Trim();
+                this.queryText = text.Replace(NewLine, " ");
+            }
+        }
+
+        public string ClusteredMode
+        {
+            get { return this.clusteredMode; }
+            set
+            {
+                this.clusteredMode = value.Trim().Replace(NewLine, " ");
+            }
+        }
+
+        public bool IsClusteredMode
+        {
+            set
+            {
+                this.isClusteredMode = value;
+            }
+        }
+
+        public bool HasMissingIndex
+        {
+            get { return this.hasMissingIndex; }
+        }
+
+        public string MissingIndexQueryText
+        {
+            get { return this.missingIndexQueryText; }
+        }
+
+        public string MissingIndexImpact
+        {
+            get { return this.missingIndexImpact; }
+        }
+
+        public string MissingIndexDatabase
+        {
+            get { return this.missingIndexDatabase; }
+        }
+
+        #endregion
+        
+        #region Member variables
+
+        private string title = string.Empty;
+        private string queryText = string.Empty;
+        private string toolTipQueryText = string.Empty;
+        private string clusteredMode = string.Empty;
+        private bool   isClusteredMode = false;
+        
+        private bool   hasMissingIndex = false;        
+        private string missingIndexCaption = string.Empty;    // actual caption text that will be displayed on the screen
+        private string missingIndexQueryText = string.Empty;  // create index query
+        private string missingIndexImpact = string.Empty;     // impact
+        private string missingIndexDatabase = string.Empty;   // database context
+
+        private const string NewLine = "\r\n";       
+
+        #endregion
+    }
+}