OWNERS: Add the core team

Gerrit configuration changes now require a +2 code review from an OWNER before changes can land.

Add the all core team members to the OWNERS file.

Change-Id: I696ca1afeae1cae80c04b1644a60482f932586ab
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/70023
Auto-Submit: Ben Clayton <bclayton@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Ben Clayton <bclayton@google.com>
diff --git a/OWNERS b/OWNERS
index 6b0f599..4608031 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,8 @@
+amaiorano@google.com
+bclayton@chromium.org
 bclayton@google.com
 cwallez@chromium.org
 dneto@google.com
+jrprice@google.com
 rharrison@google.com
+sarahmashay@google.com