Add the MS open source code of conduct

Author: rgregg

README.md

@@ -161,3 +161,7 @@ The OneDrive SDK for Android library is supported at runtime for [Android API re
 ## 9. Third Party Notices
 
 [Third Party Notices](THIRD PARTY NOTICES)
+
+## 10. Code of Conduct
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.