Add note about release sdcard zip

README.md

@@ -12,6 +12,8 @@ This Keybow OS is RAM-disk-based and built upon a stripped-down Raspbian, with C
 
 Format a micro-SD card in FAT32 format (we recommend the SD Association's [SD Card Formatter](https://www.sdcard.org/downloads/formatter_4/), and then drop the contents of the [sdcard](sdcard) folder (only the files inside the folder) onto the freshly-formatted micro-SD card.
 
+You can grab the latest `keybow-x.x.x.zip` file from https://github.com/pimoroni/keybow-firmware/releases and unzip it directly to your SD card.
+
 [Learn more about how to use Keybow on our learning portal](https://learn.pimoroni.com/keybow).
 
 ## Building