Add OWNERS in frameworks/multidex

* 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: Ie19555aa2e95b2cd5d88e388cdccb44f641c471d
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..9733b29
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,4 @@
+aqj@google.com
+benoitlamarche@google.com
+jplesot@google.com
+yroussel@google.com