add instantiation flow

Issue-ID: SO-608

Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
Change-Id: I00b02c80c357ce5379d89769a3552e826ef257cc

diff --git a/docs/developer_info/instantiate/instantiation/index.rst b/docs/developer_info/instantiate/instantiation/index.rst
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+.. This work is licensed under a Creative Commons Attribution 4.0
+.. International License. http://creativecommons.org/licenses/by/4.0
+.. Copyright 2019 ONAP Contributors.  All rights reserved.
+
+.. _doc_guide_user_ser_inst:
+
+
+Service Instantiation methods
+=============================
+
+
+Declare PNF instances:
+
+.. toctree::
+   :maxdepth: 2
+
+   Declare PNF instances <./pnf_instance/index.rst>
+
+Instantiate a Service:
+
+.. toctree::
+   :maxdepth: 2
+
+   using ONAP VID Portal with "A La Carte" method <./vid/index.rst>
+   using ONAP UUI Portal with "e2eServiceInstance" method <./uui/index.rst>
+   using ONAP NBI REST API (TM Forum) <./nbi/index.rst>
+   using ONAP SO REST API with "A La Carte" method <./so1/index.rst>
+   using ONAP SO REST API with "Macro" mode method <./so2/index.rst>