hwsim: add README.md

hwsim-test-network/README.md

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+To verify the script is working correctly, try it out against a virtualized Wi-Fi network as follows:
+
+	apt-get install vtun bridge-utils hostapd
+	cd hwsim-test-network
+	./initradios.sh
+	./hostap0.sh # Start fist access point in window 1
+	./hostap1.sh # Start second access point in window 2
+
+Now read the documentation in `krack-ft-test.py`. Go to step 3 and start the tool using:
+
+	../krack-ft-test.py wpa_supplicant -D nl80211 -i wlan2 -c supplicant.conf
+
+Follow the next steps. To generate traffic in step 5 use `./gen-traffic.py`.