Added untracked files

Filtration.ThemeEditor/Services/ThemePersistenceService.cs

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+using System.IO;
+using System.Xml.Serialization;
+using Filtration.ObjectModel.ThemeEditor;
+
+namespace Filtration.ThemeEditor.Services
+{
+    internal interface IThemePersistenceService
+    {
+        Theme LoadTheme(string filePath);
+        void SaveTheme(Theme theme, string filePath);
+    }
+
+    internal class ThemePersistenceService : IThemePersistenceService
+    {
+        public Theme LoadTheme(string filePath)
+        {
+            var xmlSerializer = new XmlSerializer(typeof(Theme));
+
+            Theme loadedTheme;
+
+            using (Stream reader = new FileStream(filePath, FileMode.Open))
+            {
+                loadedTheme = (Theme)xmlSerializer.Deserialize(reader);
+            }
+            
+            loadedTheme.FilePath = filePath;
+            return loadedTheme;
+        }
+
+        public void SaveTheme(Theme theme, string filePath)
+        {
+            var xmlSerializer = new XmlSerializer(typeof(Theme));
+
+            using (Stream writer = new FileStream(filePath, FileMode.Create))
+            {
+                xmlSerializer.Serialize(writer, theme);
+            }
+        }
+    }
+}