Add project files.

ObservatoryCore/PluginManagement/PlaceholderPlugin.cs

@@ -0,0 +1,38 @@
+using Observatory.Framework;
+using Observatory.Framework.Files;
+using Observatory.Framework.Files.Journal;
+using Observatory.Framework.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Observatory.PluginManagement
+{
+    public class PlaceholderPlugin : IObservatoryNotifier
+    {
+        public PlaceholderPlugin(string name)
+        {
+            this.name = name;
+        }
+
+        public string Name => name;
+
+        private string name;
+
+        public string ShortName => name;
+
+        public string Version => string.Empty;
+
+        public PluginUI PluginUI => new PluginUI(PluginUI.UIType.None, null);
+
+        public object Settings { get => null; set { } }
+
+        public void Load(IObservatoryCore observatoryCore)
+        { }
+
+        public void OnNotificationEvent(string title, string text)
+        { }
+    }
+}