logic added

Massmailer.Shared/Logic/MassmailerProjectLogic.cs

@@ -0,0 +1,28 @@
+using Massmailer.Shared.Model;
+using Newtonsoft.Json;
+using System.IO;
+using System.Threading.Tasks;
+
+namespace Massmailer.Shared.Logic
+{
+    public static class MassmailerProjectLogic
+    {
+        public async static void Save(MassmailerProject project, string filePath)
+        {
+            var json = JsonConvert.SerializeObject(project);
+            await File.WriteAllTextAsync(filePath, json);
+        }
+
+        public async static Task<MassmailerProject> Load(string filePath)
+        {
+            var project = new MassmailerProject();
+            if (File.Exists(filePath))
+            {
+                var json = await File.ReadAllTextAsync(filePath);
+                project = JsonConvert.DeserializeObject<MassmailerProject>(json);
+            }
+
+            return project;
+        }
+    }
+}