Update README.md

README.md

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 # Passky-Android
+## What is Passky?
+Passky is simple password manager, which works on a zero trust architecture. That means only user will be able to decrypt his passwords. So users can safely store their passwords on any server. That means if a server on where all passwords are stored get hacked, hacker won't be able to decrypt passwords and data on this server will be useless for him.
+
+## Installation
+### Google Play
+1. Visit Google Play on mobile device and search for Passky (https://play.google.com/store/apps/details?id=com.rabbitcompany.passky)
+2. Click on "Install" button
+3. Passky is now installed