Link to Ironic dev-quickstart in contributing doc

Ironic dev-quickstart contains many relevant pieces of information for
development against other Ironic projects, such as NGS. This
information, like available tox environments and how to setup Ironic
devstack, is valid for some NGS development cases as well.

Change-Id: I660462d005d8f85bb880cf892cd0fbb33402ecab

Author: jayofdoom

CONTRIBUTING.rst

@@ -64,3 +64,15 @@ Creating new device plugins
    The only required option is ``device_type`` that must be equal to the
    entrypoint you have registered your plugin under, as it is used for plugin
    lookup (see provided ``Netmiko``-based plugins for example).
+
+
+Additional Contributor Resources
+================================
+GenericSwitch is a member of the Bare Metal (ironic) program in OpenStack.
+Development of GenericSwitch follows many ironic conventions.
+
+The `Ironic developer quickstart <https://docs.openstack.org/ironic/latest/contributor/dev-quickstart.html>_`
+has some relevant information -- particularly on unit testing with tox,
+integration testing with devstack, and other information that may be useful
+for GenericSwitch developers. As the documentation is written targetting
+Ironic, it should only be used as a general guideline.