Add a smorgasboard example

examples/smorgasboard/app.js

@@ -0,0 +1,32 @@
+import { Foo, Bar, concat } from "./smorgasboard";
+
+function assertEq(a, b) {
+  if (a !== b)
+    throw new Error(`${a} != ${b}`);
+  console.log(`found ${a} === ${b}`);
+}
+
+assertEq(concat('a', 'b'), 'ab');
+
+// Note the `new Foo()` syntax cannot be used, static function
+// constructors must be used instead. Additionally objects allocated
+// corresponding to Rust structs will need to be deallocated on the
+// Rust side of things with an explicit call to `free`.
+let foo = Foo.new();
+assertEq(foo.add(10), 10);
+foo.free();
+
+// Pass objects to one another
+let foo1 = Foo.new();
+let bar = Bar.from_str("22", { opaque: 'object' });
+foo1.add_other(bar);
+
+// We also don't have to `free` the `bar` variable as this function is
+// transferring ownership to `foo1`
+bar.reset('34');
+foo1.consume_other(bar);
+
+assertEq(foo1.add(2), 22 + 34 + 2);
+foo1.free();
+
+alert('all passed!')