Added mono module

modules/mono/editor/GodotSharpTools/Project/ProjectExtensions.cs

@@ -0,0 +1,49 @@
+using System;
+using Microsoft.Build.Construction;
+
+namespace GodotSharpTools.Project
+{
+    public static class ProjectExtensions
+    {
+        public static bool HasItem(this ProjectRootElement root, string itemType, string include)
+        {
+            string includeNormalized = include.NormalizePath();
+
+            foreach (var itemGroup in root.ItemGroups)
+            {
+                if (itemGroup.Condition.Length != 0)
+                    continue;
+
+                foreach (var item in itemGroup.Items)
+                {
+                    if (item.ItemType == itemType)
+                    {
+                        if (item.Include.NormalizePath() == includeNormalized)
+                            return true;
+                    }
+                }
+            }
+
+            return false;
+        }
+
+        public static void AddItemChecked(this ProjectRootElement root, string itemType, string include)
+        {
+            if (!root.HasItem(itemType, include))
+            {
+                root.AddItem(itemType, include);
+            }
+        }
+
+        public static Guid GetGuid(this ProjectRootElement root)
+        {
+            foreach (var property in root.Properties)
+            {
+                if (property.Name == "ProjectGuid")
+                    return Guid.Parse(property.Value);
+            }
+
+            return Guid.Empty;
+        }
+    }
+}