Change README to README.md for github presentation.

This isn't the final README text, of course, but it should
show up formatted now on github.

README.md

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+
+    Mininet: A Simple Virtual Testbed for OpenFlow/SDN
+                        or
+    How to Squeeze an OpenFlow Network onto your Laptop
+
+Mininet 2.0.0d2
+
+---
+**Welcome to Mininet!**
+
+Mininet creates OpenFlow test networks by using process-based
+virtualization and network namespaces.
+
+Simulated hosts (as well as switches and controllers with the user
+datapath) are created as processes in separate network namespaces. This
+allows a complete OpenFlow network to be simulated on top of a single
+Linux kernel.
+
+Mininet may be invoked directly from the command line, and also provides a
+handy Python API for creating networks of varying sizes and topologies.
+
+In order to run Mininet, you must have:
+
+* A Linux kernel compiled with network namespace support
+  enabled (see `INSTALL` for additional information.)
+
+* An OpenFlow implementation (either the reference user or kernel
+  space implementations, or Open vSwitch.) Appropriate kernel modules
+  (e.g. tun and ofdatapath for the reference kernel implementation) must
+  be loaded.
+
+* Python, `bash`, `ping`, `iperf`, etc.
+
+* Root privileges (required for network device access)
+
+Currently Mininet includes:
+
+- A simple node infrastructure (Host, Switch, Controller classes) for
+  creating virtual OpenFlow networks
+	
+- A simple network infrastructure (Mininet class) supporting parametrized
+  topologies (Topo subclasses.) For example, a tree network may be created
+  with the command
+  
+  `# mn --topo tree,depth=2,fanout=3`
+  
+- Basic tests, including connectivity (ping) and bandwidth (iperf)
+
+- A command-line interface (CLI class) which provides useful 
+  diagnostic commands, as well as the ability to send a command to a
+  node. For example,
+  
+  `mininet> h11 ifconfig -a`
+  
+  tells host h11 to run the command `ifconfig -a`
+
+- A 'cleanup' command to get rid of junk (interfaces, processes, files in
+  /tmp, etc.) which might be left around by Mininet or Linux. Try this if 
+  things stop working!
+  
+  `# mn -c`
+  
+- Examples (in the examples/ directory) to help you get started.
+
+Batteries are not included (yet!)
+
+However, some preliminary installation notes are included in the INSTALL
+file.
+
+Additionally, much useful information, including a Mininet tutorial,
+is available on the [Mininet Wiki](http://openflow.org/mininet).
+
+Enjoy, and good luck!
+
+---
+Bob Lantz
+rlantz@cs.stanford.edu
+