create doc for atomic operations

Author: mahenzon

docs/atomic_operations.rst

@@ -0,0 +1,13 @@
+.. _atomic_operations:
+
+Atomic Operations
+=================
+
+.. currentmodule:: fastapi_jsonapi
+
+
+Atomic Operations allows to perform multiple “operations” in a linear and atomic manner.
+Operations are a serialized form of the mutations allowed in the base JSON:API specification.
+
+Clients can send an array of operations in a single request.
+This extension guarantees that those operations will be processed in order and will either completely succeed or fail together.

docs/changelog.rst

@@ -2,6 +2,20 @@ Changelog
 #########
 
 
+**2.1.0**
+*********
+
+Atomic Operations
+=================
+
+* Atomic Operations (see :ref:`example <atomic_operations>`, `JSON:API doc <https://jsonapi.org/ext/atomic/>`_)
+
+Authors
+"""""""
+
+* `@mahenzon`_
+
+
 **2.0.0**
 *********