Add more details to the readme

README.md

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-# umbrel-cloudflared
-Umbrel web app for Cloudflare Tunnel client (cloudflared)
+# Umbrel Cloudflare Tunnel client
+Access your [Umbrel](https://umbrel.com/) apps from the Internet using Cloudflare network. Learn more about tunnels on [Cloudflare website](https://www.cloudflare.com/products/tunnel/).
+
+![Screenshot](repository-assets/screen-1.png)
+
+Get it from:
+- Umbrel app store – comming soon
+- [Radiokot's Umbrel apps](https://github.com/Radiokot/umbrel-app-store)
+
+## How to use it
+
+To use this app, you must have a set up Cloudflare account with added domains. Check out [the guide with examples](https://github.com/Radiokot/umbrel-cloudflared/wiki/How-to-set-up-Cloudflare-Tunnel-on-your-Umbrel) to configure your own tunnel.
+
+## Sponsorship
+I am very grateful to everyone [supporting this project](https://radiokot.com.ua/tip) ♥ To join the public sponsors list, email me the transaction reference once it is complete.
 
 ## Environment variables
 |Name|Meaning|