update readme

README.md

@@ -9,9 +9,13 @@ A GNOME Shell extension that shows your next calendar event in the status bar.
 Tested on GNOME 42.4.
 
 
+## Installation
+You can install the extension from [the extensions.gnome.org page](https://extensions.gnome.org/extension/5465/next-up/) by clicking the switch icon.
+
+
 ## References
 - https://gitlab.gnome.org/GNOME/gnome-shell/-/blob/main/js/ui/calendar.js
 - https://extensions.gnome.org/extension/4448/next-meeting/
 - https://github.com/corecoding/Vitals
 
-- [Party popper icon](https://www.flaticon.com/free-icon/party-popper_6335608) by [Ayub Irawan](https://www.flaticon.com/authors/ayub-irawan)
+- [Party popper icon](https://www.flaticon.com/free-icon/party-popper_6335608) by [Ayub Irawan](https://www.flaticon.com/authors/ayub-irawan)