docs: add README.md

Author: mohamedsamara

README.md

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+# What is Chatty App?
+
+Chatty is a chat application that let users message from macOS and web.
+
+## Features
+
+- Create one-to-one chat and message privately
+- Create group conversations
+- Send text, photos and videos
+
+## Download
+
+Install Chatty from the [Github releases](https://github.com/mohamedsamara/chatty-app/releases) section.