Added README

README.md

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+Breakbox
+========
+
+Breakbox is a network fault injection tool that aims to simplify resilience and stability testing.
+Its core component is an agent that accepts commands over HTTP and configures its host's network stack
+for various common fault scenarios.
+
+Currently these include:
+-   Total network partition
+-   Remote service dead (not listening on the expected port)
+-   Delays
+-   Packet loss
+-   TCP connection timeout (as often happens when two systems are separated by a stateful firewall)
+
+An RPM package is available for the agent. See [Releases](https://github.com/tomakehurst/breakbox/releases "Releases").