Added a brief README

README.md

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+# Services and Communication Systems
+
+Subject of the MSc in Computer Science course at the University of Milano-Bicocca.
+
+## Implementation of a firewall functionality using SDN with a OpenFlow architecture
+
+Written in Italian, in this essay are presented some firewall functions
+implemented through a Software-defined Network architecture using an OpenFlow
+protocol analyzing the possible advantages and implications that can derive in
+both security and in network management.
+
+## Performances of firewalls built with dedicated appliances: dependency on the number of rules and possible optimizations
+
+Written in Italian, based on the prototype of an SDN-enabled (stateful) hardware
+firewall that uses OpenFlow as a communication protocol. It focuses on the
+impact that the number of rules applied on a firewall can have on performances
+and discuss the possible practices to be adopted or avoided) to mitigate such
+issues.