Add Emergetools badge

README.md

@@ -2,6 +2,7 @@
 
 [![Download on the App Store](Images/download_on_the_app_store.svg)](https://apps.apple.com/us/app/ice-cubes-for-mastodon/id6444915884)
 
+<a href="https://www.emergetools.com/app/example/ios/com.thomasricouard.IceCubesApp/manual"><img src="https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fwww.emergetools.com%2Fapi%2Fv2%2Fpublic_new_build%3FexampleId%3Dcom.thomasricouard.IceCubesApp%26platform%3Dios%26badgeOption%3Dversion_and_max_install_size%26buildType%3Dmanual&query=$.badgeMetadata&label=Ice%20Cubes&logo=apple" /></a>
 
 <img src="Images/promo.png" />