Add OWNERS file to shell/dagger/

To allow changes to dagger modules without having to be a
/WindowManager/Shell owner.

Flag: EXEMPT owners file
Bug: None
Test: N/A
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c246b882a7f0dc00da59e9381710aca94e85ae71)
Merged-In: I143be212bd46913be528bd69b17200d268bdec69
Change-Id: I143be212bd46913be528bd69b17200d268bdec69
1 file changed