Bug 1872971 - Move CODEOWNERS file to correct location

The CODEOWNERS file needs to be in [the root directory][0] for it to be
evaluated. Since we've merged projects, the code and team structures
have changed, so let's start off with a simple one that includes some
known basics and iteratively add more directory paths from there.

[0]: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#codeowners-file-location

CODEOWNERS

@@ -0,0 +1,30 @@
+# 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 [email protected].
+# https://help.github.com/articles/about-codeowners/
+
+# Release Engineering pipeline
+/.cron.yml                      @mozilla-mobile/releng
+/.taskcluster.yml               @mozilla-mobile/releng
+/android-components/automation/ @mozilla-mobile/aet @mozilla-mobile/QA
+/fenix/automation/              @mozilla-mobile/aet @mozilla-mobile/QA
+/focus-android/automation/      @mozilla-mobile/aet @mozilla-mobile/QA
+/taskcluster/                   @mozilla-mobile/releng @mozilla-mobile/aet
+
+# Any android components that may need specific people to be notified
+/android-components/components/feature/accounts-push/             @jonalmeida
+/android-components/components/feature/push/                      @jonalmeida
+
+/android-components/components/lib/push-firebase/                 @jonalmeida
+/android-components/components/lib/state/                         @csadilek @jonalmeida