Docs : Add minimal contribution guidelines

Fixes : kata-containers#50

See : kata-containers/community#5

Signed-off-by: Yash Jain <ydjainopensource@gmail.com>

Author: Yash Jain

CONTRIBUTING.md

@@ -0,0 +1,5 @@
+# Contributing
+
+## This repo is part of [Kata Containers](https://katacontainers.io)
+
+For details on how to contribute to the Kata Containers project, please see the main [contributing document](https://github.com/kata-containers/community/blob/master/CONTRIBUTING.md).