Update CODEOWNERS with new ownership rules (#718)

* Update CODEOWNERS with new ownership rules

* Update CODEOWNERS with new paths and owners

* Add new code owners for all paths

* Update CODEOWNERS

* Update CODEOWNERS to reflect new ownership

Author: yrezgui

CODEOWNERS

@@ -0,0 +1,5 @@
+*               @yrezgui @kkuan2011
+/compose/       @android/devrel-compose
+/car/           @android/devrel-car
+/wear/          @android/devrel-wear
+/xr/            @android/devrel-xr