WA-238 Add Balance List component

src/routes/safe/component/Safe/Balance.jsx

@@ -0,0 +1,20 @@
+// @flow
+import * as React from 'react'
+import { ListItem, ListItemText } from 'material-ui/List'
+import Avatar from 'material-ui/Avatar'
+import AccountBalance from 'material-ui-icons/AccountBalance'
+
+type Props = {
+  balance: string,
+}
+
+const Balance = ({ balance }: Props) => (
+  <ListItem>
+    <Avatar>
+      <AccountBalance />
+    </Avatar>
+    <ListItemText primary="Balance" secondary={`${balance} ETH`} />
+  </ListItem>
+)
+
+export default Balance