Added Passwords Fountain to Example Apps section (#54)

Repo URL: https://github.com/kolodziejczakM/passwords-fountain

readme.md

@@ -142,6 +142,7 @@
 - [**Intergram**](https://www.intergram.xyz) A live chat widget linked to your Telegram messenger built using Preact. _([Github project](https://github.com/idoco/intergram))_.
 - [**Preact App in ES6 without Babel or JSX**](https://vanilla-preact.surge.sh) _([GitHub Project](https://github.com/safdarjamal/vanilla-preact/))_.
 - [**GHFresh**](https://code2k.github.io/ghfresh/) Monitor GitHub repository releases – Prerendering with Preact. Built with Preact Compat, TypeScript, Material-UI and Redux Toolkit. _([GitHub Project](https://github.com/code2k/ghfresh))_.
+- [**Passwords Fountain**](https://passwords-fountain.com/) - modern & performant password manager interface which works everywhere _([Github project](https://github.com/kolodziejczakM/passwords-fountain))_.
 
 ### Related Libraries
 - [React](https://github.com/facebook/react) - A declarative, efficient, and flexible JavaScript library for building user interfaces.