Add README.rst to security-doc repo

[Vikram Hosakote]

The security-doc repository has very useful documentation needed for the OpenStack Security Guide.

But, unlike the openstack-manuals repo, the security-doc repo does not have a README.rst file.

Hence, README.rst must be added to security-doc with all the information needed for a new contributor.

A README.rst will also create a nice landing page for the security-doc repo in GitHub at https://github.com/openstack/security-doc.

[Vikram Hosakote (vhosakot)]

Fixing this bug.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/279906

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/279906
Committed: https://git.openstack.org/cgit/openstack/security-doc/commit/?id=39e42975c44866946e5180b5b4c070605e5e23d5
Submitter: Jenkins
Branch: master

commit 39e42975c44866946e5180b5b4c070605e5e23d5
Author: Vikram Hosakote <email address hidden>
Date: Sat Feb 13 23:43:00 2016 +0000

    Add README.rst to security-doc repo

    The security-doc repository has very useful documentation needed for the
    OpenStack Security Guide. But, unlike the openstack-manuals repo, the
    security-doc repo does not have a README.rst file.

    Hence, this patch set adds README.rst to security-doc with all the information
    needed for a new contributor.

    The README.rst in this patch set will also create a nice landing page for the
    security-doc repo in GitHub at https://github.com/openstack/security-doc.

    Change-Id: I6a0222be0e1f1378f36b2a31011391ae4bbec164
    Closes-Bug: 1545355