added rdoc formatting to README

README.rdoc

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+= localtunnel -- instant public tunnel for local web servers
+
+Dependencies: 
+- Ruby (with libopenssl) and Rubygems.  
+- A public key.
+
+Type <tt>sudo apt-get install ruby ruby1.8-dev rubygems1.8
+libopenssl-ruby</tt> to satisfy dependencies.
+
+Run <tt>ssh-keygen</tt> if you have never made a public key.
+
+== Install 
+
+    sudo gem install localtunnel 
+
+or to get the source:
+
+    git clone http://github.com/progrium/localtunnel.git
+
+
+== Usage
+
+    localtunnel [options] <localport>
+      -k, --key FILE    upload a public key for authentication
+
+localtunnel is a client to a free and open source reverse tunneling
+service made specifically for web traffic. It's intended to be used to
+temporarily expose local web servers to the greater Internet for
+debugging, unit tests, demos, etc.   
+
+This is how you make your local port 8080 public:
+
+    $ localtunnel 8080
+
+Port 8080 is now publicly accessible from http://8bv2.localtunnel.com ...
+
+Using localtunnel is comparable to using SSH reverse/remote port
+forwarding on a remote host that has GatewayPorts enabled, but without
+all the configuration or the need of a host. The localtunnel command
+works with a server component that is running on localtunnel.com,
+which is provided as a free service.
+
+If have never run localtunnel before, you'll need to upload a public
+key to authenticate. You do this once:
+
+    $ localtunnel -k ~/.ssh/id_rsa.pub 8080
+
+After that, you shouldn't have to use -k again.
+
+localtunnel can be started before or after the local web server.   It
+tunnels through to the url given in that status message "publicly
+accessible from..." for as long as the command is running.  The tunnel
+is closed if the command exits.
+