Add back examples in README.md

Signed-off-by: Rushi Agrawal <rushi.agr@gmail.com>

NOTICE.txt

@@ -0,0 +1,8 @@
+OpenSearch (https://opensearch.org/)
+Copyright OpenSearch Contributors
+
+This product includes software developed by
+Elasticsearch (http://www.elastic.co).
+
+This product includes software developed by The Apache Software
+Foundation (http://www.apache.org/).

README.md

@@ -12,6 +12,38 @@ OpenSearch Python Client
 
 **opensearch-py** is [a community-driven, open source fork](https://aws.amazon.com/blogs/opensource/introducing-opensearch/) of elasticsearch-py licensed under the [Apache v2.0 License](LICENSE.txt). For more information, see [opensearch.org](https://opensearch.org/).
 
+## Example use
+
+```python
+
+>>> from datetime import datetime
+>>> from opensearch import OpenSearch
+
+# by default we connect to localhost:9200
+>>> client = OpenSearch()
+
+# create an index in OpenSearch, ignore status code 400 (index already exists)
+>>> client.indices.create(index='my-index', ignore=400)
+{'acknowledged': True, 'shards_acknowledged': True, 'index': 'my-index'}
+
+# datetimes will be serialized
+>>> client.index(index="my-index", id=42, body={"any": "data", "timestamp": datetime.now()})
+{'_index': 'my-index',
+    '_type': '_doc',
+    '_id': '42',
+    '_version': 1,
+    'result': 'created',
+    '_shards': {'total': 2, 'successful': 1, 'failed': 0},
+    '_seq_no': 0,
+    '_primary_term': 1}
+
+# but not deserialized
+>>> client.get(index="my-index", id=42)['_source']
+{'any': 'data', 'timestamp': '2019-05-17T17:28:10.329598'}
+
+```
+
+
 ## Project Resources
 
 * [Project Website](https://opensearch.org/)
@@ -35,4 +67,4 @@ This project is licensed under the [Apache v2.0 License](LICENSE.txt).
 
 ## Copyright
 
-Copyright 2020-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+Copyright OpenSearch Contributors. See [NOTICE](NOTICE.txt) for details.