Add Skydive startup guide documentation

Just a simple startup guide for Skydive

Change-Id: I79c175c592fba9d078cee9b1b948597ec60bc68c

doc/index.rst

@@ -72,6 +72,7 @@ Services
    kuryr-guide
    zun-guide
    osprofiler-guide
+   skydive-guide
 
 Developer Docs
 ==============

doc/skydive-guide.rst

+.. _skydive-guide:
+
+================
+Skydive in Kolla
+================
+
+Overview
+========
+Skydive is an open source real-time network topology and protocols analyzer.
+It aims to provide a comprehensive way of understanding what is happening in
+the network infrastructure.
+Skydive agents collect topology information and flows and forward them to a
+central agent for further analysis.
+All the information is stored in an Elasticsearch database.
+
+Configuration on Kolla deployment
+---------------------------------
+
+Enable Skydive in ``/etc/kolla/globals.yml``
+
+.. code-block:: console
+
+    enable_skydive: "yes"
+    enable_elasticsearch: "yes"
+
+Verify operation
+----------------
+
+After successful deployment, Skydive can be accessed using a browser on
+``<kolla_external_vip_address>:8085``.
+
+The default username is ``admin``, the password can be located under
+``<keystone_admin_password>`` in ``/etc/kolla/passwords.yml``.
+
+For more information about how Skydive works, see
+`Skydive – An open source real-time network topology and protocols analyzer
+<https://github.com/skydive-project/skydive/>`__.