fix(readme): Add Obtainium button (#1293)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: retardgerman <78982850+retardgerman@users.noreply.github.com>

README.md

@@ -70,6 +70,7 @@ Check out our [Roadmap](https://github.com/users/fredrikburmester/projects/5) To
   <a href="https://apps.apple.com/app/streamyfin/id6593660679?l=en-GB"><img height=50 alt="Get Streamyfin on App Store" src="./assets/Download_on_the_App_Store_Badge.png"/></a>
   <a href="https://play.google.com/store/apps/details?id=com.fredrikburmester.streamyfin"><img height=50 alt="Get Streamyfin on Google Play Store" src="./assets/Google_Play_Store_badge_EN.svg"/></a>
   <a href="https://github.com/streamyfin/streamyfin/releases/latest"><img height=50 alt="Get Streamyfin on Github" src="./assets/Download_on_Github_.png"/></a>
+  <a href="https://apps.obtainium.imranr.dev/redirect.html?r=obtainium://add/https://github.com/streamyfin/streamyfin"><img height=50 alt="Add Streamyfin to Obtainium" src="./assets/Download_with_Obtainium.png"/></a>
 </div>
 
 ### 🧪 Beta Testing