Add OWNERS in packages/services/Telephony

* Owners are selected from top CL approvals or owners.
  They will be suggested to review/approve future CLs.
* OWNERS files are recognized by the new find-owners plugin, see .md files in
  https://gerrit.googlesource.com/plugins/find-owners/+/master/src/main/resources/Documentation/

Test: build/make/tools/checkowners.py -c -v OWNERS
Change-Id: I0da854b457f4c798d851d6b2e8762ae22eeb24f0
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..3d790e2
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,7 @@
+amitmahajan@google.com
+breadley@google.com
+fionaxu@google.com
+hallliu@google.com
+jackyu@google.com
+rgreenwalt@google.com
+tgunn@google.com