add DatabaseProvider

app/index.js

@@ -1,8 +1,11 @@
 import React from 'react';
 import { render } from 'react-dom';
+import DatabaseProvider from '@nozbe/watermelondb/DatabaseProvider';
+import database from './db';
 import App from './dapp';
 
 render(
-  <App />,
-  document.getElementById('app')
+  <DatabaseProvider database={database}>
+    <App />
+  </DatabaseProvider>, document.getElementById('app')
 );