display account, net ID, and error

app/js/components/App.js

@@ -1,4 +1,19 @@
+import React from 'react';
+
 export default function App(props) {
-  return `Hello World ${props.account}`;
+  if (!props.initialized) {
+    return "initializing...";
+  }
+
+  if (props.error) {
+    return <>
+      <p>Error: {props.error}</p>
+    </>;
+  }
+
+  return <>
+    <p>Network ID {props.networkID}</p>
+    <p>Hello {props.account}</p>
+  </>;
 }
 

app/js/containers/App.js

@@ -2,7 +2,10 @@ import { connect } from 'react-redux';
 import App from '../components/App';
 
 const mapStateToProps = state => ({
+  initialized: state.web3.networkID,
+  networkID: state.web3.networkID,
   account: state.web3.account,
+  error: state.web3.error,
 });
 
 const mapDispatchToProps = dispatch => ({