Sets up CODEOWNERS file

.github/CODEOWNERS

@@ -0,0 +1,22 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This CODEOWNERS file defines individuals or teams that are responsible
+# for code in this repository. Code owners are automatically requested
+# for review when someone opens a pull request that modifies code that
+# they own. Order is important; the last matching pattern takes the most
+# precedence.
+# A CODEOWNERS file uses a pattern that follows the same rules used in
+# gitignore files. The pattern is followed by one or more GitHub usernames
+# or team names using the standard @username or @org/team-name format.
+# You can also refer to a user by an email address that has been added
+# to their GitHub account, for example user@example.com.
+# https://help.github.com/articles/about-codeowners/
+
+
+# By default the Android Components team will be the owner for everything in
+# the repo. Unless a later match takes precedence.
+* @mozilla-mobile/act
+/automation @mozilla-mobile/releng
+/.github @mozilla-mobile/releng