modified file names

src/components/posts/PostList.tsx

@@ -0,0 +1,12 @@
+import { Datagrid, List, ReferenceField, TextField,} from 'react-admin';
+
+export const PostList = () => (
+    <List>
+        <Datagrid>
+            <ReferenceField source="userId" reference="users" />
+            <TextField source="id" />
+            <TextField source="title" />
+            <TextField source="body" />
+        </Datagrid>
+    </List>
+);