Add Contributing section to README

Author: jkodumal

README.md

@@ -38,4 +38,9 @@ Your first feature flag
 Learn more
 ----------
 
-Check out our [documentation](http://docs.launchdarkly.com) for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the [complete reference guide for this SDK](http://docs.launchdarkly.com/v1.0/docs/java-sdk-reference) or our [Javadocs](http://launchdarkly.github.io/java-client/).
+Check out our [documentation](http://docs.launchdarkly.com) for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the [complete reference guide for this SDK](http://docs.launchdarkly.com/v1.0/docs/java-sdk-reference) or our [Javadocs](http://launchdarkly.github.io/java-client/).
+
+Contributing
+------------
+
+We encourage pull-requests and other contributions from the community. We've also published an [SDK contributor's guide](http://docs.launchdarkly.com/v1.0/docs/sdk-contributors-guide) that provides a detailed explanation of how our SDKs work.