Add example of a resource with hidden immutable data

runner/wit/test.wit

@@ -1,10 +1,19 @@
 package my:project;
 
-world test {
+interface types {
+    resource testresource {
+        hello: func();
+    }
+
+
     record record-string {
         hello-string: string,
     }
+}
+
+world test {
+    use types.{testresource, record-string};
 
     import hello: func(hello-string: record-string);
-    export greet: func(hello-string: record-string);
+    export greet: func(hello-string: record-string, input-resource: testresource);
 }