Add OWNERS in packages/providers/TelephonyProvider

* 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: I50449f1edf45c0f518e316276b5383131814c67a
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..691af77
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,5 @@
+amitmahajan@google.com
+fionaxu@google.com
+jminjie@google.com
+rgreenwalt@google.com
+tomtaylor@google.com