LISP: add Sodium release notes

Change-Id: Iac786acf0f8555abc31f0e782e1c5d72375057c9
Signed-off-by: Lori Jakab <lojakab@cisco.com>

diff --git a/docs/release-notes/projects/lispflowmapping.rst b/docs/release-notes/projects/lispflowmapping.rst
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+=================
+LISP Flow Mapping
+=================
+
+Overview
+========
+
+The LISP Flow Mapping service provides LISP Mapping System services.
+This includes LISP Map-Server and LISP Map-Resolver services to store
+and serve mapping data to data plane nodes as well as to OpenDaylight
+applications. Mapping data can include mapping of virtual addresses to
+physical network addresses where the virtual nodes are reachable or hosted
+at. Mapping data can also include a variety of routing policies
+including traffic engineering and load balancing. To leverage this
+service, OpenDaylight applications and services can use the northbound
+REST API to define the mappings and policies in the LISP Mapping
+Service. Data plane devices capable of LISP control protocol can
+leverage this service through a southbound LISP plugin. LISP-enabled
+devices must be configured to use this OpenDaylight service as their Map-
+Server and/or Map-Resolver.
+
+The southbound LISP plugin supports the LISP control protocol
+(Map-Register, Map-Request, Map-Reply messages), and can also be used to
+register mappings in the OpenDaylight mapping service.
+
+Behavior Changes
+================
+
+This is a maintenance release with no behavior changes.
+
+New and Modified Features
+=========================
+
+No new features were added in this release, and no existing features were
+modified.
+
+Deprecated Features
+===================
+
+No existing features were removed in this release.
+
+Resolved Issues
+===============
+
+No issues were resolved in this release.
+
+Known Issues
+============
+
+The LISP Flow Mapping Jira has a `list of known open issues <https://jira.opendaylight.org/projects/LISPMAP/issues/?filter=allopenissues>`_.