poc: began react panel experiments

public/app/plugins/panel/text2/module.tsx

@@ -0,0 +1,13 @@
+import React from 'react';
+
+export class ReactTestPanel extends React.Component<any, any> {
+  constructor(props) {
+    super(props);
+  }
+
+  render() {
+    return <h2>Panel content</h2>;
+  }
+}
+
+export { ReactTestPanel as PanelComponent };