Reorganize the import_js example

examples/import_js/crate/defined-in-js.js

@@ -0,0 +1,21 @@
+export function name() {
+    return 'World';
+}
+
+export class MyClass {
+    constructor() {
+        this._number = 42;
+    }
+
+    get number() {
+        return this._number;
+    }
+
+    set number(n) {
+        return this._number = n;
+    }
+
+    render() {
+        return `My number is: ${this.number}`;
+    }
+}