Add download link (#14)

README.md

@@ -4,6 +4,8 @@ This is a proof of concept for a desktop pet written in Tauri.
 
 We have a blog post on our website you can follow: https://crabnebula.dev/blog/building-a-desktop-pet-with-tauri
 
+And you can download the app here: [https://web.crabnebula.cloud/crabnebula/koi-pond/releases](https://web.crabnebula.cloud/crabnebula/koi-pond/releases)
+
 ## Recommended IDE Setup
 
 - [VS Code](https://code.visualstudio.com/) + [Tauri](https://marketplace.visualstudio.com/items?itemName=tauri-apps.tauri-vscode) + [rust-analyzer](https://marketplace.visualstudio.com/items?itemName=rust-lang.rust-analyzer)