added attribution for android robot

Author: davidchesnut

NOTICES.md

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+#Third Party Notices for Microsoft Graph Explorer
+
+This project incorporates material from the project(s) listed below (collectively, "Third Party Code"). Microsoft is not the original author of the Third Party Code. The original copyright notices and licenses, under which Microsoft received such Third Party Code, are set out below together with the full text of such licenses. These notices and licenses are provided for informational purposes only. This Third Party Code is licensed to you under the terms set forth in the licenses set forth below. Microsoft reserves all other rights not expressly granted under this agreement, whether by implication, estoppel or otherwise. 
+
+- The Android robot is reproduced or modified from work created and shared by Google and used according to terms described in the [Creative Commons 3.0 Attribution License](http://creativecommons.org/licenses/by/3.0/).