update credits (#219)

* update credits

* update to include subpackages under credits

* fix typo

Author: thomaszurkan-optimizely

README.md

@@ -88,3 +88,18 @@ For example, to release version 0.1.2 you need to pull devel, checkout master, p
 ## Contributing
 Please see [CONTRIBUTING](CONTRIBUTING.md).
 
+### Credits
+
+First-party code (under android-sdk/, datafile-handler/, event-handler/, shared/, user-profile/) is copyright Optimizely, Inc. and contributors, licensed under Apache 2.0
+
+### Additional Code
+
+This software incorporates code from the following open source projects:
+
+**Optimizely.ab:core-api** [https://github.com/optimizely/java-sdk](https://github.com/optimizely/java-sdk)
+License (Apache 2.0): [https://github.com/optimizely/java-sdk/blob/master/LICENSE](https://github.com/optimizely/java-sdk/blob/master/LICENSE)
+Additional credits from java-sdk:[https://github.com/optimizely/java-sdk/blob/master/README.md](https://github.com/optimizely/java-sdk/blob/master/README.md)
+
+**Android Logger** [https://github.com/noveogroup/android-logger](https://github.com/noveogroup/android-logger)
+License (Public Domain): [https://github.com/noveogroup/android-logger/blob/master/LICENSE.txt](https://github.com/noveogroup/android-logger/blob/master/LICENSE.txt)
+