restore readme

Author: d-v-b

README.md

@@ -44,6 +44,14 @@
     </a>
   </td>
 </tr>
+<tr>
+  <td>Pre-commit Status</td>
+  <td>
+    <a href=""https://github.com/zarr-developers/zarr-python/blob/main/.pre-commit-config.yaml">
+    <img src="https://results.pre-commit.ci/badge/github/zarr-developers/zarr-python/main.svg" alt="pre-commit status" />
+    </a>
+  </td>
+</tr>
 
 <tr>
   <td>Coverage</td>