Merge "refactor instantiate section to be more "purpose" oriented adding configure section Issue-ID: DOC-500"

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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.
+
+
+Service Instantiation
+=====================
+
+**Pre-requisites**
+
+- the Service has been designed and distributed (see: Service Design)
+- pre-instantiation operations have been performed
+  (see: pre instantiation section)
+
+**Possible Tools to perform Service Instantiation**
+
+- **via a Graphical User Interface tool**
+  using ONAP applications such as **ONAP VID** and **ONAP UUI** tools
+
+- **via any tool able to perform REST API requests**
+  (for example : Robot Framework, Postman, Curl...) connected
+  to **ONAP SO** legacy API or **ONAP extAPI/NBI** standard TMF641 API
+  to add/delete Service.
+
+**Possible methods with ONAP to instantiate a Service**
+
+- **A La Carte**
+  method requires the user to build and send
+  operations **for each object** to instantiate : Service, VNFs,
+  VFModules and Networks (in other words : once you have instantiated
+  the Service object, you still have to instantiate the various VNFs
+  or Networks that compose your Service).
+  To build those requests, the user needs to define/collect by himself
+  all necessary parameters/values.
+
+- **Macro**
+  method allows the user to build and send
+  **only one request to instantiate all objects** : Service, VNFs,
+  VFModules and Networks. Thanks to templates (see CDS Blueprint in
+  Design section),
+  ONAP will collect and assign all required parameters/values by itself.
+
+
+   Note: **Macro** method is not (yet) available via ONAP VID
+   nor via extAPI/NBI
+
+With "A La Carte" method
+------------------------
+
+.. toctree::
+   :maxdepth: 1
+
+      using ONAP VID Portal  <../vid/index.rst>
+      using ONAP NBI REST API (TM Forum) <../nbi/index.rst>
+      using ONAP SO REST API <../so1/index.rst>
+
+With "Macro" method
+-------------------
+
+.. toctree::
+   :maxdepth: 1
+
+      using ONAP SO REST API <../so2/index.rst>