Add link to iOS binary

app/developing.md

@@ -29,4 +29,8 @@ If you are able to create debug logs and create Issues feel free to subscribe th
 * flash that image on the card10
 * The ios-workarounds branch basically exposes all characteristics publicly, so everybody can connect to your card10 and read / write characteristic, so this is clearly only a development helper and not ment for day-to-day usage
 
+**OR**
+
+* Use [this file](card10-ios-branch.bin) and transfer it as *card10.bin* over USB to your card10 
+
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