policy2tosca doc patch set-3

Change-Id: Icc2ad677a55bfe0f58bbfad6305674e7764422ea
Signed-off-by: shiva-charan <shiva-charan.m-s@hpe.com>

diff --git a/docs/parser_docs/policy2tosca/policy2tosca.rst b/docs/parser_docs/policy2tosca/policy2tosca.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
+
+===================
+Parser POLICY2TOSCA
+===================
+
+Overview
+========
+
+Parser is an open source project and licensed under Apache 2. Parser will help
+to provide a tooling mechanism, by parsing Telecom operators’ VNF descriptors
+(YANG templates) into TOSCA templates and then further translate TOSCA
+templates into certain common templates, which could be used in IaaS orchestration
+projects like OpenStack Heat.
+
+Prerequisites
+=============
+
+Parser - POLICY2TOSCA requires the following to be installed.
+
+1. cliff
+--------
+
+Install cliff with the following links.
+::
+- `install <http://docs.openstack.org/developer/cliff/install.html>`
+or
+- `demoapp <http://docs.openstack.org/developer/cliff/demoapp.html>`
+
+Installation
+============================
+
+Please follow the below installation steps to install parser - POLICY2TOSCA.
+
+Step 1: Clone the parser project.
+
+.. code-block:: bash
+
+    git clone https://gerrit.opnfv.org/gerrit/parser
+
+Step 2: Install the policy2tosca module.
+
+.. code-block:: bash
+
+    cd parser/policy2tosca
+    python setup.py install
+
+Execution
+===========================
+
+Step 1: To see a list of commands available.
+
+.. code-block:: bash
+
+    policy2tosca --help
+
+Step 2: To see help for an individual command, include the command name on the command line
+
+.. code-block:: bash
+
+    policy2tosca help <service>
+
+Step 3: To inject/remove policy types/policy definitions provide the TOSCA file as input to policy2tosca command line.
+
+.. code-block:: bash
+
+    policy2tosca <service> [arguments]
+
+Example:
+
+.. code-block:: bash
+
+    policy2tosca add-definition --policy_name rule2 --policy_type  tosca.policies.Placement.Geolocation --description "test description" --properties region:us-north-1,region:us-north-2,min_inst:2 --targets VNF2,VNF4 --metadata "map of strings" --triggers "1,2,3,4" --source example.yaml
+
+
+Step 4: Verify the TOSCA YAMl updated with the injection/removal executed.
+
+.. code-block:: bash
+
+    cat "<source tosca file>"
+
+Example:
+
+.. code-block:: bash
+
+    cat example_tosca.yaml