Created react app, changed Dockerfile to include UI files

rpdata-ui/src/App.js

@@ -0,0 +1,14 @@
+import React, { Component } from 'react';
+import './App.css';
+
+class App extends Component {
+  render() {
+    return (
+      <div className="App">
+        <p>Hi</p>
+      </div>
+    );
+  }
+}
+
+export default App;