Add completion message to code example

The purpose of this addition is to provide clarity to the user executing the code, indicating that the operation has finished successfully.

README.md

@@ -117,5 +117,7 @@ for item in dataset['train']:
 # Insert any remaining documents
 if len(insert_data) > 0:
     collection.insert_many(insert_data)
-    print("Data Ingested")
+    print("{} records ingested".format(len(insert_data)))
+
+print("All records ingested successfully!")
 ```