Add MFKey to firmware

applications/system/mfkey/.catalog/README.md

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+# Flipper Zero MFKey
+
+This application allows you to calculate the keys of MIFARE Classic cards using the Mfkey32 and Nested algorithms directly on your Flipper Zero. After collecting the nonces using the Extract MF Keys feature of the NFC app, they can be used to calculate the keys to the card in the MFKey app.
+
+## Usage
+
+After collecting nonces using the Extract MF Keys option, press the Start button in the MFKey app and wait for it to finish. The calculation can take more than 10 minutes, so you'll have to be patient. After the calculation is complete, the keys will be saved to the user key dictionary.
+
+## Credits
+
+Developers: noproto, AG, Flipper Devices, WillyJL
+Thanks: AloneLiberty, Foxushka, bettse, Equip

applications/system/mfkey/.catalog/changelog.md

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+## 3.0
+ - Added Static Encrypted Nested key recovery, added NFC app support, dropped FlipperNested support
+## 2.7
+ - Mfkey32 recovery is 30% faster, fix UI and slowdown bugs
+## 2.6
+ - Version bump for catalog build system
+## 2.5
+ - Plugin path fixed
+## 2.4
+ - Update API for app rename
+## 2.3
+ - Update API v65.0
+## 2.0
+ - Added Nested key recovery, use new KeysDict API, fix crashes, more efficient RAM utilization, faster
+## 1.1
+ - Rework application with new NFC API
+## 1.0
+ - Initial release