add contributing guidelines

CONTRIBUTING.md

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+# Contributing
+
+Here are some ways for you to get involved in the community:
+
+* Get involved with the Spring community on the Spring Community Forums.  Please help out on the [forum](http://forum.springsource.org/forumdisplay.php?87-Hadoop) by responding to questions and joining the debate.
+* Create [JIRA](https://jira.springframework.org/browse/SHDP) tickets for bugs and new features and comment and vote on the ones that you are interested in.  
+* Watch for upcoming articles on Spring by [subscribing](http://www.springsource.org/node/feed) to springframework.org.
+
+Github is for social coding: if you want to write code, we encourage contributions through pull requests from [forks of this repository](http://help.github.com/forking/). If you want to contribute code this way, read the Spring Framework [contributor guidelines] (https://github.com/SpringSource/spring-framework/blob/master/CONTRIBUTING.md).
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