Added demo for cpp module and updated the CppModule

Plugins/CppModuleDemo/InternalSettings.cs

@@ -0,0 +1,10 @@
+using CppCompatibilityModule;
+using CppCompatibilityModule.Extern;
+
+namespace CppModuleDemo;
+
+internal static class InternalSettings
+{
+    internal static ExternalApplicationHandler? ExternalApplicationHandler { get; set; } = null;
+    internal static Guid DemoModuleInternalId { get; set; } = Guid.Empty;
+}