Subzero: initial codereview and OWNERS files, copied from libcxxabi.

BUG= none
R=jfb@chromium.org

Review URL: https://codereview.chromium.org/205113003
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..a3f938a
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,8 @@
+dschuff@chromium.org
+eliben@chromium.org
+jfb@chromium.org
+jvoung@chromium.org
+kschimpf@google.com
+mseaborn@chromium.org
+sehr@chromium.org
+stichnot@chromium.org