Created maintainers file. Fixes #1175.

MAINTAINTERS.md

+# Maintainers
+
+People responsible for ports of Kubernetes to different environments. CC at least one maintainer on relevant issues and PRs.
+
+## OS Distributions
+
+* RedHat, Fedora: [Clayton Coleman](https://github.com/smarterclayton), [Derek Carr](https://github.com/derekwaynecarr), [Scott Collier](https://github.com/scollier)
+* CoreOS: [Kelsey Hightower](https://github.com/kelseyhightower)
+
+## Providers / Environments
+
+* GCE: [Brendan Burns](https://github.com/brendandburns), [Joe Beda](https://github.com/jbeda), [Daniel Smith](https://github.com/lavalamp), [Tim Hockin](https://github.com/thockin)
+* Azure: [Jeff Mendoza](https://github.com/jeffmendoza)
+* Vsphere: [Pieter Noordhuis](https://github.com/pietern)
+* Rackspace: [Ryan Richard](https://github.com/doublerr)
+* Ovirt: [Federico Simoncelli](https://github.com/simon3z)
+* Local: [Derek Carr](https://github.com/derekwaynecarr)
+* Vagrant: [Derek Carr](https://github.com/derekwaynecarr)
\ No newline at end of file