add Arduino Gemma Bootloader source files

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diff --git a/bootloaders/gemma/README.md b/bootloaders/gemma/README.md
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+Arduino Gemma Bootloader
+========================
+
+The Arduino Gemma Bootloader is based on the Adafruit Trinket/Gemma Bootloader. In the Arduino Gemma bootloader the USB VID&PID, the Manufacturer name and the Device name parameters are changed.
+
+The source code of the bootloader of the version used at the compile time can be found at the following link: https://github.com/adafruit/Adafruit-Trinket-Gemma-Bootloader/tree/3bc1bb561273535d4d493518a233a3a1fccf6b76
+
+The *'usbconfig.h'* and the *'usbconfig.patch'* files are provided if you want to recompile the bootloader.
+You only need to replace the original *'usbconfig.h'* file with this one or patch it with the provided patch file.
+
+**Please note: you cannot use the Arduino USB VID/PID for your own non-Gemma products or projects. Purchase a USB VID for yourself at**  http://www.usb.org/developers/vendor/ 
+
+
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