Update README.md

README.md

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-# fz-em4100-generator
+# fz-em4100-generator [![FlipC.org](https://flipc.org/Milk-Cool/fz-em4100-generator/badge)](https://flipc.org/Milk-Cool/fz-em4100-generator)
 A program that generates universal keys from a EM4100 key
+
+## Installing
+Click the FAP badge, connect your flipper and click "Install".