Create README.md

README.md

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+MFOC is an open source implementation of "offline nested" attack by Nethemba.
+
+This program allow to recover authentication keys from MIFARE Classic card.
+
+Please note MFOC is able to recover keys from target only if it have a known key: default one (hardcoded in MFOC) or custom one (user provided using command line).
+
+# Usage #
+Put one MIFARE Classic tag that you want keys recovering;
+Lauching mfoc, you will need to pass options, see
+```
+mfoc -h
+```