Add README

Author: mhaas

contrib/load-tester/README.md

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+## Wifidog Load Tester ##
+
+* generate\_interfaces.sh: Sets up pseudo interfaces and creates a fake ARP
+  table in /tmp/arp. Make sure that the IP addresses used do not collide with
+  your real network
+* mock\_auth.py: A mock auth server. Randomly grants or denies access
+* fire\_requests.py: Hammers Wifidog with requests. talks to wifidog, never
+  to the auth server.
+* run.sh: Ties it all together. Make sure to run as root. 
+