contributors: remove CONTRIBUTORS.md file

Remove CONTRIBUTORS.md file since, this repo is now part of the
kata-containers organization, the other repos don't have this file
and we are not willing to maintain (update) it.

Signed-off-by: Julio Montes <julio.montes@intel.com>

CONTRIBUTORS.md

@@ -1,22 +0,0 @@
-This file is a partial list of contributors to the Virtual Machine
-Manager for Go project. To see the full list of contributors, see the
-revision history in source control.
-
-Contributors who wish to be recognized in this file should add
-themselves (or their employer, as appropriate).
-
-- afrosi@de.ibm.com
-- archana.m.shinde@intel.com
-- caoruidong@huawei.com
-- clare.chenhui@huawei.com
-- eric.ernst@intel.com
-- james.o.hunt@intel.com
-- jose.carlos.venegas.munoz@intel.com
-- julio.montes@intel.com
-- manohar.r.castelino@intel.com
-- mark.d.ryan@intel.com
-- robert.bradford@intel.com
-- sameo@linux.intel.com
-- sebastien.boeuf@intel.com
-- teawater@hyper.sh
-- xinda.zhao@intel.com