Initial version of HACKING.rst
Initial version of HACKING.rst

This patch provides a starting point for developers who want to help out
with scripts development. More information can be added later, but this
should already be reasonably useful.

Change-Id: I64732aadc8a3e7c8eec12d886fa5b1ce52dab0af

openstack/training-labs,openstack/training-labs,dguitarbite/OpenStack-Labs,dguitarbite/OpenStack-Labs,openstack/training-labs,dguitarbite/OpenStack-Labs