Fixed more input accessibility issues, also

- Added searchParams based router for easier testing
 - Added more stories to the storybook

stories/ModalAdd.stories.js

@@ -0,0 +1,25 @@
+import React from 'react';
+import ModalAdd from '../src/components/ModalAdd';
+import {action} from '@storybook/addon-actions';
+import {Wrapper} from './ui';
+import {withA11y} from '@storybook/addon-a11y';
+
+
+export default {
+  title: 'ModalAdd',
+  component: ModalAdd,
+  decorators: [withA11y],
+};
+
+export const Basic = () => (
+  <Wrapper>
+    <div style={{maxHeight: "200px"}}>
+      <ModalAdd
+        layers={[]}
+        sources={{}}
+        isOpen={true}
+      />
+    </div>
+  </Wrapper>
+);
+