Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I93d4b998e079c5f088a0d3dd3e849951b3b0ec53
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..be4e3c0
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,7 @@
+# Default code reviewers picked from top 3 or more developers.
+# Please update this list if you find better candidates.
+jzern@google.com
+djsollen@google.com
+pascal.massimino@gmail.com
+# skal@google.com
+# libwebp-{en,de}code is used by external/{skia,skqp}