LogDog: Add collector service implementation.

server/internal/logdog/coordinatorClient/doc.go

Index: server/internal/logdog/coordinatorClient/doc.go
diff --git a/server/internal/logdog/coordinatorClient/doc.go b/server/internal/logdog/coordinatorClient/doc.go
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Package coordinatorClient is a thin client library wrapped around the LogDog
+// Coordinator's Service endpoint. It is intended to be used by LogDog
+// processing services.
+//
+// This differs from github.com/luci/luci-go/common/logdog/coordinator in that
+// it targets specifically the service endpoint and is a much thinner wrapper
+// around that endpoint.
+package coordinatorClient