Add docs.

Signed-off-by: jinwei.fan <jinwei.fan@samsung.com>
Change-Id: I156163b1e68b48cab4f775e354d7bef68fd613fd

docs/release-notes.rst

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. SPDX-License-Identifier: CC-BY-4.0
+.. Copyright (C) 2020 AT&T Intellectual Property
+
+Release Notes
+===============
+
+All notable changes to this project will be documented in this file.
+
+The format is based on `Keep a Changelog <http://keepachangelog.com/>`__
+and this project adheres to `Semantic Versioning <http://semver.org/>`__.
+
+
+[1.0.1] - 1/20/2021
+--------------------
+
+* Use SDL lib to replace direct use of Redis client
+* Add xapp descriptor
+
+
+[1.0.0] - 12/16/2020
+--------------------
+
+* Update builder image
+* Change key name
+
+
+[0.4.0] - 11/27/2020
+------------------
+
+* Fix RIC_INDICATION RANContainer decoding issue
+* Fix data format issue when storing data into DB
+
+
+[0.3.0] - 10/16/2020
+------------------
+
+* Fix interface type issue when decoding RIC_INDICATION
+* Integration test with e2sim
+
+
+[0.2.0] - 7/17/2020
+------------------
+
+* CI config
+* Add memory free function for E2AP/E2SM encoding and decoding
+* Log output
+* Code optimization
+
+
+[0.1.0] - 4/21/2020
+-------------------
+
+* RIC_INDICATION
+* Store UE/Cell metrics into Redis DB
+* Small cleanups
+
+
+[0.0.2] - 3/25/2020
+-------------------
+
+* RIC_SUB_REQ
+* Helm chart
+* Dockerfile
+
+
+[0.0.1] - 3/10/2020
+-------------------
+
+* inital skeleton creation