chore: import upstream snapshot with attribution

javascript/visualizers/index.jsx

@@ -0,0 +1,15 @@
+import SimpleListVisualizer from "./SimpleListVisualizer";
+import AdditiveForceVisualizer from "./AdditiveForceVisualizer";
+import AdditiveForceArrayVisualizer from "./AdditiveForceArrayVisualizer";
+
+export {
+  SimpleListVisualizer,
+  AdditiveForceVisualizer,
+  AdditiveForceArrayVisualizer
+};
+
+export default {
+  SimpleListVisualizer,
+  AdditiveForceVisualizer,
+  AdditiveForceArrayVisualizer
+};