Added demo for cpp module and updated the CppModule

Plugins/CppModuleDemo/ExampleComplexObject.cs

@@ -0,0 +1,19 @@
+using System.Runtime.InteropServices;
+
+namespace CppModuleDemo;
+
+[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+public struct ExampleComplexObject
+{
+    public int IntegerValue;
+    public double DoubleValue;
+    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
+    public string StringValue;
+    
+    public ExampleComplexObject(int integerValue, double doubleValue, string stringValue)
+    {
+        IntegerValue = integerValue;
+        DoubleValue = doubleValue;
+        StringValue = stringValue;
+    }
+}