Add OWNERS to luci-go.

BUG=

Review URL: https://codereview.chromium.org/1666303002

Cr-Original-Commit-Position: refs/heads/master@{#373669}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b6bd151a94c2206449de57c6167c6bf17cc40b6f
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..8b03e48
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,3 @@
+maruel@chromium.org
+tandrii@chromium.org
+vadimsh@chromium.org