Add project files.

Client/Interop.cs

@@ -0,0 +1,15 @@
+using Microsoft.JSInterop;
+using System.Threading.Tasks;
+
+namespace SZUAbsolventenverein.Module.EventRegistration
+{
+    public class Interop
+    {
+        private readonly IJSRuntime _jsRuntime;
+
+        public Interop(IJSRuntime jsRuntime)
+        {
+            _jsRuntime = jsRuntime;
+        }
+    }
+}