Update README.md

Author: rickycpadilla

README.md

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 # passage-flex-react-native
 
+[![npm version](https://badge.fury.io/js/@passageidentity%2Fpassage-flex-react-native.svg)](https://badge.fury.io/js/@passageidentity%2Fpassage-flex-react-native)
+
 Passkey Flex provides passkey support for existing authentication systems. It abstracts the complexities of native passkey APIs and provides a simple, clean solution to take your authentication to the next level.
 
 Use the `passage-flex-react-native` SDK in your React Native app to implement passkey registration, authentication, or additinal step-up or multifactor authentication (MFA).