Добавил классы для работы плагинов в проект с формами

InternetShop/InternetShopForms/InternetShopForms.csproj

@@ -22,6 +22,7 @@
     <ProjectReference Include="..\InternetShopContracts\InternetShopContracts.csproj" />
     <ProjectReference Include="..\InternetShopDatabase\InternetShopDatabase.csproj" />
     <ProjectReference Include="..\InternetShopLogics\InternetShopLogics.csproj" />
+    <ProjectReference Include="..\PluginConventions\PluginConventions.csproj" />
   </ItemGroup>
 
 </Project>

InternetShop/InternetShopForms/Plugins/PluginsConvention.cs

@@ -0,0 +1,48 @@
+using PluginConventions;
+
+namespace InternetShopForms.Plugins
+{
+    public class PluginsConvention : IPluginsConvention
+    {
+        public string PluginName => throw new NotImplementedException();
+
+        public UserControl GetControl => throw new NotImplementedException();
+
+        public PluginsConventionElement GetElement => throw new NotImplementedException();
+
+        public bool CreateChartDocument(PluginsConventionSaveDocument saveDocument)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool CreateSimpleDocument(PluginsConventionSaveDocument saveDocument)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool CreateTableDocument(PluginsConventionSaveDocument saveDocument)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool DeleteElement(PluginsConventionElement element)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Form GetForm(PluginsConventionElement element)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Form GetThesaurus()
+        {
+            throw new NotImplementedException();
+        }
+
+        public void ReloadData()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

InternetShop/InternetShopForms/Plugins/PluginsConventionProvider.cs

@@ -0,0 +1,9 @@
+using PluginConventions;
+
+namespace InternetShopForms.Plugins
+{
+    public class PluginsConventionProvider : PluginsConventionElement
+    {
+
+    }
+}