QMP: Introduce README file

Signed-off-by: Luiz Capitulino <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>

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+                          QEMU Monitor Protocol
+                          =====================
+
+Introduction
+-------------
+
+The QEMU Monitor Protocol (QMP) is a JSON[1] based protocol for QEMU.
+
+By using it applications can control QEMU in reliable and "parseable" way,
+QMP also provides asynchronous events support.
+
+For more information, please, refer to the following files:
+
+o qmp-spec.txt    QEMU Monitor Protocol current draft specification
+o qmp-events.txt  List of available asynchronous events
+
+There are also two simple Python scripts available:
+
+o qmp-shell       A shell
+o vm-info         Show some informations about the Virtal Machine
+
+[1] http://www.json.org
+
+Usage
+-----
+
+To enable QMP, QEMU has to be started in "control mode". This is done
+by passing the flag "control" to the "-monitor" command-line option.
+
+For example:
+
+$ qemu [...] -monitor control,tcp:localhost:4444,server
+
+Will start QEMU in control mode, waiting for a client TCP connection
+on localhost port 4444.
+
+To manually test it you can connect with telnet and issue commands:
+
+$ telnet localhost 4444
+Trying ::1...
+Connected to localhost.
+Escape character is '^]'.
+{"QMP": {"capabilities": []}}
+{ "execute": "query-version" }
+{"return": "0.11.50"}
+
+Contact
+-------
+
+http://www.linux-kvm.org/page/MonitorProtocol
+Luiz Fernando N. Capitulino <[email protected]>