Add CONTRIBUTING, update LICENSE, add CHANGELOG

Author: jkodumal

CHANGELOG.md

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+# Change log
+
+
+All notable changes to the LaunchDarkly Java SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
+
+## [2.0.0] - 2016-08-08
+### Added
+- Support for multivariate feature flags. New methods `boolVariation`, `jsonVariation` and `intVariation` and `doubleVariation` for multivariates.
+- Added `LDClientInterface`, an interface suitable for mocking `LDClient`.
+
+### Changed
+- The `Feature` data model has been replaced with `FeatureFlag`. `FeatureFlag` is not generic.
+- The `allFlags` method now returns a `Map<String, JsonElement>` to support multivariate flags.
+
+### Deprecated
+- The `toggle` call has been deprecated in favor of `boolVariation`.
+
+### Removed
+- The `getFlag` call has been removed.
+- The `debugStreaming` configuration option has been removed.

CONTRIBUTING.md

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+Contributing to the LaunchDarkly SDK for Java
+================================================
+
+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.

LICENSE

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-Copyright 2014 Catamorphic, Co.
+Copyright 2016 Catamorphic, Co.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.