Update README.md

README.md

@@ -19,6 +19,10 @@ Flipper Authenticator is a software-based authenticator that implements two-step
 
 It is like [Google Authenticator](https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2), but for [Flipper Zero](https://flipperzero.one/) device.
 
+## Companion app
+
+There is a companion app for desktop allowing you to interract with Flipper Authenticator in a more user-friendly way. Latest builds as well as all the information about it can be found in its official repo [here](https://github.com/akopachov/flipper-zero_authenticator-companion)
+
 ## SAST Tools
 
 [PVS-Studio](https://pvs-studio.com/en/pvs-studio/?utm_source=github&utm_medium=organic&utm_campaign=open_source) - static analyzer for C, C++, C#, and Java code.