Update RELEASE.md

RELEASE.md

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 # Release Notes
 
+## 2016.02.23
+### Proposition
+This is a proposition on how to utilize standard Android SDK even further, to achieve wide adoption (Android 5 and 6) and best security. All code is in separate branch for now [f_android_uaf_client](https://github.com/eBay/UAF/tree/f_android_uaf_client)
+
+### Proposition Goal
+Main goal is to utilize the AndroidKeyStore as a security provider to generate the keys and to do the signatures. That way the keys are stored, and used in the most secure way. 
+
+Usage of standard security interfaces, such as:
+```
+java.security.KeyPairGenerator
+java.security.KeyStore
+java.security.Signature
+```
+
+Usage of EC algorithm in Android 6, and falling back to standard RSA algorithm in case of Android 5.
+
+### Proposition Implementation
+The new Android module has been added: [Marvin - Android UAF client](https://github.com/eBay/UAF/tree/f_android_uaf_client/fidouafclient/marvin)
+
+In this module you will see the UAF Client implemented with plain Android SDK. The only added compile dependency being GSON library.
+
+Key generation example for UAF Reg operation:
+- [Android 6](https://github.com/eBay/UAF/blob/f_android_uaf_client/fidouafclient/marvin/src/main/java/org/ebayopensource/fidouaf/marvin/client/op/Reg.java#L209)
+- [Android 5](https://github.com/eBay/UAF/blob/f_android_uaf_client/fidouafclient/marvin/src/main/java/org/ebayopensource/fidouaf/marvin/client/op/Reg.java#L95)
+
+Signature for UAF Auth operation
+- [Android 6](https://github.com/eBay/UAF/blob/f_android_uaf_client/fidouafclient/marvin/src/main/java/org/ebayopensource/fidouaf/marvin/client/AuthAssertionBuilder.java#L205)
+- [Android 5](https://github.com/eBay/UAF/blob/f_android_uaf_client/fidouafclient/marvin/src/main/java/org/ebayopensource/fidouaf/marvin/client/AuthAssertionBuilder.java#L183)
+
+Hope to hear your feedback and comments!
+
+Cheers,
+Neb.
+
+
 ## 2016.01.16
 In this release of the eBay UAF implementation, in the test UAF client, Android SDK is bumped to version 21 (Android 5).