docs: add NOTICE

NOTICE

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+(c) 2015 LinkedIn Corp. 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  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied.
+
+This product includes software developed by The Apache Software
+Foundation (http://www.apache.org/).
+
+This product includes/uses Snappy-Java (https://github.com/xerial/snappy-java)
+Copyright (c) 2011 Taro L. Saito
+License: Apache 2.0
+
+This product includes/uses Jackson (http://jackson.codehaus.org/)
+Copyright (c) 2007- Tatu Saloranta, [email protected]
+License: Apache 2.0
+
+This product includes/uses ParaNamer (https://github.com/paul-hammant/paranamer)
+Copyright (c) 2006- Paul Hammant & ThoughtWorks Inc
+License: BSD
+
+This product includes/uses SLF4J (http://slf4j.org)
+Copyright (c) 2004 QOS.ch
+License: MIT
+
+This product includes/uses TestNG (http://testng.org/)
+Copyright (c) 2004 Cedric Beust
+License: Apache 2.0
+
+This product includes/uses Mockito (http://mockito.org/)
+Copyright (c) 2007 Mockito contributors
+License: MIT
+
+This product includes/uses Play Framework (https://www.playframework.com/)
+Copyright (c) 2009- Typesafe
+License: Apache 2.0
+
+This product includes/uses Spring Framework (http://projects.spring.io/spring-framework/)
+Copyright (c) 2002- the original author or authors
+License: Apache 2.0