Added initial README

README.md

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+# Flipper Authenticator
+
+![Screenshot](.github/assets/screenshot_1.png)
+
+## What is it?
+
+Flipper Authenticator is a software-based authenticator that implements two-step verification services using the Time-based One-time Password (TOTP; specified in RFC 6238) and HMAC-based One-time Password algorithm.
+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.
+
+## How to get it?
+
+If you don't want to build the app yourself then just pull FAP file from [latest release](https://github.com/akopachov/flipper-zero_authenticator/releases) and put it to your Flipper Zero device by copying it to `/ext/apps/Misc`. After that you should be able to run it on your Flipper.
+
+## How to build it?
+
+Just pull the repo with recursive submodule initialization and then run `fbt firmware_totp` command to build the app. Once done FAP file will be available here `flipperzero-firmware\build\latest\totp.fap`
+
+## Support
+* [Buy me a coffee](https://buycoffee.to/akopachov)
+* BTC: `bc1qu9k48q93uhvr9w5cn8fzz5yxuvh4e27c6hnczq`