Add settings modal with speed limit presets

client/source/scripts/components/sidebar/SettingsButton.js

@@ -0,0 +1,25 @@
+import React from 'react';
+
+import SettingsIcon from '../icons/SettingsIcon';
+import UIActions from '../../actions/UIActions';
+
+class SettingsButton extends React.Component {
+  constructor() {
+    super();
+  }
+
+  handleSettingsButtonClick() {
+    UIActions.displayModal({id: 'settings'});
+  }
+
+  render() {
+    return (
+      <a className="sidebar__icon-button sidebar__icon-button--settings"
+        onClick={this.handleSettingsButtonClick}>
+        <SettingsIcon />
+      </a>
+    );
+  }
+}
+
+export default SettingsButton;