Add temp genshin index page

src/pages/genshin/index.tsx

@@ -0,0 +1,20 @@
+import { Box, Heading, Paragraph } from '@theme-ui/components'
+import React from 'react'
+import Breadcrumb from '../../components/organisms/Breadcrumb'
+import RootNavigator from '../../components/organisms/RootNavigator'
+
+const GenshinIndexPage = () => {
+  return (
+    <Box>
+      <RootNavigator />
+
+      <Box p={3}>
+        <Breadcrumb items={[{ href: 'genshin', label: 'Genshin' }]} />
+        <Heading as='h1'>Genshin</Heading>
+        <Paragraph>Under Construction...</Paragraph>
+      </Box>
+    </Box>
+  )
+}
+
+export default GenshinIndexPage