HONEYCOMB-46: Add NSH_SFC Readme doc

Change-Id: Id1f8f17d025ebba07db0d138f881384306046487
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>
(cherry picked from commit 2d6efba64a5050cb8349c874b5e4d7dadacb28e0)

diff --git a/nsh/Readme.adoc b/nsh/Readme.adoc
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+= nsh
+
+This is a Honeycomb plugin providing mapping code between HC and NSH_SFC Plugin APIs.
+
+== Usage
+
+Refer to nsh_postman_collection.json for sample requests. All capabilities of NSH_SFC are demo-ed there.
+
+In order to make HC NSH plugin work, need to start vpp and load nsh_sfc plugin first.
+
+Please follow the right order to support NSH_SFC feature:
+(1). Creates vxlan-gpe interface.
+(2). Creates nsh-entry.
+(3). Creates nsh-map. 
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