readme: add contribution and links

Ignition should be up to the standard of our other open source projects
outlining how to get involved and where to find and file bugs. Follow
the template of etcd.

README.md

@@ -6,7 +6,21 @@ Ignition is the utility used by CoreOS Container Linux to manipulate disks durin
 
 Odds are good that you don't want to invoke Ignition directly. In fact, it isn't even present in the Container Linux root filesystem. Take a look at the [Getting Started Guide][getting started] for details on providing Ignition with a runtime configuration.
 
-Use the [bug tracker][issues] to report bugs.
+## Contact
+
+- Mailing list: [coreos-dev](https://groups.google.com/forum/#!forum/coreos-dev)
+- IRC: #[coreos](irc://irc.freenode.org:6697/#coreos) on freenode.org
+- Bugs: [issues][issues]
+
+## Contributing
+
+See [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches and the contribution workflow.
+
+To help triage or fix bugs, see the current [Ignition issues](https://github.com/coreos/bugs/labels/component%2Fignition).
+
+## Reporting Bugs
+
+- To report a bug, use the [bug tracker][issues]
 
 ## Config Validation