feat: add CI and Codecov badges to README

Author: devin-ai-integration[bot]

.github/workflows/build.yml

@@ -70,6 +70,7 @@ jobs:
           files: coverage/pytest-results.xml,coverage/junit.xml
           fail_ci_if_error: true
 
+
       - name: Package the extension
         run: |
           set -eux

README.md

@@ -1,5 +1,8 @@
 # jupyterlab_deepnote
 
+[![CI](https://github.com/deepnote/jupyterlab-deepnote/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/deepnote/jupyterlab-deepnote/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/deepnote/jupyterlab-deepnote/branch/main/graph/badge.svg)](https://codecov.io/gh/deepnote/jupyterlab-deepnote)
+
 A Deepnote extension for JupyterLab
 
 This extension is composed of a Python package named `jupyterlab_deepnote`