Midas-specific README to replace Linux' README

Author: atrib

Diff for: README

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+# Midas: Systematic Kernel TOCTTOU Protection
+
+This repository contains the source code for a Linux-based
+prototype of Midas
+([website](https://hexhive.epfl.ch/midas/),
+[paper](https://infoscience.epfl.ch/record/290014)).
+The prototype is based on the paper
+*Midas: Systematic Kernel TOCTTOU Protection*
+accepted for publication at the 
+*31st Usenix Security Symposium, 2022*.
+
+More information about building, running and testing the 
+kernel may be found on the linked [website](https://hexhive.epfl.ch/midas/).