Update release doc, upcoming release doc

Change-Id: Ibce6bd1f7eef5b8757b51d66503dd42a98c16fd7
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+..
+   SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+   SPDX-License-Identifier: Apache-2.0
+
+SD-Core Next Release
+========================
+
+We expect next SD-Core release to be available in the mid of **Jan 2023**.
+
+Metrics Support
+----------------
+
+     - Creating SD-Core metrics dashboard for 5G
+     - Should handle multiple instances of AMF, SMF
+     - Example statistics could be - `Number of UEs, UE status, UPFs status, gNB status, UE details`
+
+Extensions of AMF, SMF Cloud Native Support
+-------------------------------------------
+
+    - Robustness test with multiple AMF, SMF
+    - Auto scale AMF, SMF with CPU/Memory/Custom metrics
+    - Multiple instances of SCTP LBs
+    - Multiple instances of UPF adapter
+    - Adding SBI Load Balancer
+
+Cloud Native UPF
+----------------
+
+    - Running multiple instances of UPF
+    - Storing states in DB
+
+gNBSim Features
+----------------
+
+    - gNBSim deployment as single docker container
+    - Running multiple gNodeBs under same gNBSim container
+    - gNodeB handover support
+
+NRF Notification
+----------------
+
+    - NRF discovery result cache support
+    - NRF notification integration in SCTPLb, Distributed Resource Sharing Module  (DRSM)
+    - Custom node registration in NRF e.g. upf-adapter & sctplb
+
+.. note::
+   Some of the features mentioned above are stretch goals and we rely on community members to
+   submit the code. There is chance that some of the code may not be able to make it to next
+   release.