docs(README): improve documentation

Author: yoannfleurydev

README.md

@@ -1,18 +1,57 @@
-<h1 align="center">
-    GitHub Notifications
-</h1>
-<p align="center">
-  🔔 Get GitHub's notifications directly on your Mac Status Bar
-</p>
 <div align="center">
+    <img
+      src="./GitHub%20Notifications/Assets.xcassets/AppIcon.appiconset/AppIcon256.png"
+      width="200" 
+      height="200"
+    />
+    <h1>
+      GitHub Notifications
+    </h1>
+    <p>
+      <strong>🔔 Get GitHub's notifications directly on your Mac Status Bar</strong>
+    </p>
+    <br />
+    <br />
+    <br />
+</div>
+
+This macOS application is useful to let you know when you have notifications on
+your GitHub account.
+
+Require macOS 10.15 or later.
+
+<div>
   <img src="./assets/screenshot_01.png" alt="Overview of the GitHub Notifications menu bar application" />
 </div>
 
+## Download
+
+<!-- TODO add the link to the download -->
+
+## Features
+
+### Know when you have a notification
+
+By default, the application is a simple icon in your macOS status bar, and a
+little indicator appears when you have notifications.
+
+### Access [github.com/notifications](https://github.com/notifications) from the menu first item
+
+Click on the application in the status bar, and then click on the menu first
+item to access the [GitHub Notifications](https://github.com/notifications)
+page.
+
+## FAQ
+
+### I can't paste my Personal Access Token using keyboard shortcut.
+
+> You have to right click in the field in order to paste your personal access
+> token as the keyboard shortcut is not yet implemented.
 
 
 
 ---
 
 ## My git related projects
 
-- [gitweb](https://github.com/yoannfleurydev/gitweb)
+- [gitweb](https://github.com/yoannfleurydev/gitweb) 🌲 Open the current remote repository in your browser