added notebook for schema evolution (#270)

Author: KshitizLohia

ads/feature_store/docs/source/notebook.rst

@@ -24,3 +24,8 @@ Notebook Examples
       - `Big data operations with feature store <https://objectstorage.us-ashburn-1.oraclecloud.com/p/hh2NOgFJbVSg4amcLM3G3hkTuHyBD-8aE_iCsuZKEvIav1Wlld-3zfCawG4ycQGN/n/ociodscdev/b/oci-feature-store/o/beta/notebook/feature-store-big-data-ingestion-and-querying.ipynb>`__
       - | 1. Ingestion of data using spark magic
         | 2. Querying and exploration of data using spark magic
+
+    * - `Schema enforcement and schema evolution <https://objectstorage.us-ashburn-1.oraclecloud.com/p/hh2NOgFJbVSg4amcLM3G3hkTuHyBD-8aE_iCsuZKEvIav1Wlld-3zfCawG4ycQGN/n/ociodscdev/b/oci-feature-store/o/beta/notebook/feature_store_flights_schema_evolution.html>`__
+      - `Schema enforcement and schema evolution <https://objectstorage.us-ashburn-1.oraclecloud.com/p/hh2NOgFJbVSg4amcLM3G3hkTuHyBD-8aE_iCsuZKEvIav1Wlld-3zfCawG4ycQGN/n/ociodscdev/b/oci-feature-store/o/beta/notebook/feature_store_flights_schema_evolution.ipynb>`__
+      - | 1. Schema evolution is a feature that allows users to easily change a table's current schema to accommodate data that is changing over time.
+        | 2. Schema enforcement, also known as schema validation, is a safeguard in Delta Lake that ensures data quality by rejecting writes to a table that do not match the table's schema.