add keywords for the project

Author: Dou Du

pyproject.toml

@@ -5,6 +5,13 @@ build-backend = "hatchling.build"
 [project]
 name = "jupyterlab_mol_visualizer"
 readme = "README.md"
+keywords = [
+    'jupyter',
+    'jupyterlab',
+    'anywidget',
+    'osscar',
+    'extension',
+]
 license = { file = "LICENSE" }
 requires-python = ">=3.8"
 classifiers = [