Add coverage

tools/telemetry/third_party/coverage/NOTICE.txt

Index: tools/telemetry/third_party/coverage/NOTICE.txt
diff --git a/third_party/readability/LICENSE b/tools/telemetry/third_party/coverage/NOTICE.txt
similarity index 52%
copy from third_party/readability/LICENSE
copy to tools/telemetry/third_party/coverage/NOTICE.txt
index adbbc6190ded614a95f667ace7a181b34d431982..ff68ab80792aa947fa250c1518d0ba75fb4b58c4 100644
--- a/third_party/readability/LICENSE
+++ b/tools/telemetry/third_party/coverage/NOTICE.txt
@@ -1,8 +1,9 @@
-Copyright 2010 Arc90 Inc
+Copyright 2001 Gareth Rees.  All rights reserved.
+Copyright 2004-2015 Ned Batchelder.  All rights reserved.
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
+Except where noted otherwise, this software is licensed under the Apache
+License, Version 2.0 (the "License"); you may not use this work except in
+compliance with the License.  You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0