Created README.md and added relevant articles

Author: Naoshadul Islam

play-framework/README.md

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+###Relevant Articles:
+- [REST API with Play Framework in Java](http://www.baeldung.com/rest-api-with-play)
+- [Routing In Play Applications in Java](http://www.baeldung.com/routing-in-play)
+- [Introduction To Play In Java](http://www.baeldung.com/java-intro-to-the-play-framework)