Adding Documentation regarding PRH

Change-Id: I158a97dbdf06297c1cacae2da6a318adf6218a96
Issue-ID: DCAEGEN2-398
Signed-off-by: pwielebs <piotr.wielebski@nokia.com>
diff --git a/docs/sections/services/prh/index.rst b/docs/sections/services/prh/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
+
+
+PNF Registration Handler (PRH)
+==============================
+
+.. Add or remove sections below as appropriate for the platform component.
+
+**PNF Registration Handler** is a micro-service in DCAE used during Physical Network Function (PNF) Plug-n-Play to process
+the PNF Registration event.
+
+
+PRH overview and functions
+--------------------------
+
+
+.. toctree::
+    :maxdepth: 1
+       ./architecture.rst
+       ./configuration.rst
+       ./delivery.rst
+       ./installation.rst
+
+
+.. _`Offered APIs`: ../../apis/prh.rst
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