Add mailing list to README
* Skim the introductory presentation: http://potential.ventures
* Read the [documentation](http://cocotb.readthedocs.org)
-* Get involved: [Raise a bug / request an enhancement](https://github.com/potentialventures/cocotb/issues/new) (Requires a GitHub account)
+* Get involved:
+ * [Raise a bug / request an enhancement](https://github.com/potentialventures/cocotb/issues/new) (Requires a GitHub account)
+ * [Join the mailing list](https://lists.librecores.org/listinfo/cocotb)
* Get in contact: [E-mail us](mailto:cocotb@potentialventures.com)
* Follow us on twitter: [@PVCocotb](https://twitter.com/PVCocotb)
