Added MAINTAINERS to top-level repo directory

In a consensus reached in a proposal for code review process
change [1], and proposed team structure policy document [2],
adding MAINTAINERS files in repositories.

Please note, that this file is written in YAML format in order
to allow further automation around code review process.

[1] http://lists.openstack.org/pipermail/openstack-dev/2015-August/072406.html
[2] https://review.openstack.org/#/c/225376/

Change-Id: I520d5285c2002818ce9e770d1fdc3265f9c36ebe

MAINTAINERS

@@ -0,0 +1,39 @@
+---
+description:
+  For Fuel team structure and contribution policy, see [1].
+
+  This is repository level MAINTAINERS file. All contributions to this
+  repository must be approved by one or more Core Reviewers [2].
+  If you are contributing to files (or create new directories) in
+  root folder of this repository, please contact Core Reviewers for
+  review and merge requests.
+
+  If you are contributing to subfolders of this repository, please
+  check 'maintainers' section of this file in order to find maintainers
+  for those specific modules.
+
+  It is mandatory to get +1 from one or more maintainers before asking
+  Core Reviewers for review/merge in order to decrease a load on Core Reviewers [3].
+  Exceptions are when maintainers are actually cores, or when maintainers
+  are not available for some reason (e.g. on vacation).
+
+  [1] https://review.openstack.org/#/c/225376/ (to be replaced by html link once merged)
+  [2] https://review.openstack.org/#/admin/groups/664,members
+  [3] http://lists.openstack.org/pipermail/openstack-dev/2015-August/072406.html
+
+  Please keep this file in YAML format in order to allow helper scripts
+  to read this as a configuration data.
+
+maintainers:
+
+- name:   Andrii Popovych
+  email:  apopovych@mirantis.com
+  IRC:    apopovych
+
+- name:   Ivan Kliuk
+  email:  ikliuk@mirantis.com
+  IRC:    ivankliuk
+
+- name:   Sebastian Kalinowski
+  email:  skalinowski@mirantis.com
+  IRC:    prmtl