Add OWNERS in frameworks/opt/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: I6eb5e2d395307905bcd6cfa8da818353758fbc28
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..b215563
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,7 @@
+amitmahajan@google.com
+breadley@google.com
+fionaxu@google.com
+jackyu@google.com
+jsh@google.com
+rgreenwalt@google.com
+tgunn@google.com