added small readme

README.md

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+# prerequisites #
+
+* ruby 1.8.7 + rubygems
+
+* jruby >1.5.x
+
+# installation
+
+    gem install ruby-maven
+
+or
+    jgem install ruby-maven
+
+MRI performs much better due to the fast startup of the interpreter.
+
+# rmvn command
+
+that is basically a proper maven with a ruby launcher. on top of it can use a gemspec file or a Gemfile as POM. originally the idea of non-xml POMs is coming from [http://github.com/sonatype/polyglot-maven](http://github.com/sonatype/polyglot-maven). see [https://github.com/sonatype/polyglot-maven/tree/master/pmaven-jruby](https://github.com/sonatype/polyglot-maven/tree/master/pmaven-jruby) for more details about the ruby DSL, etc
+
+# jetty-run command
+
+just starts a jetty server inside a rails application if the Gemfile is suitable for jruby and suitable for maven (gems prereleased version are still a problem). if the Gemfile is suitable then just execute
+
+$ jetty-run
+
+and you will get an http port on 8080 and an https port on 8443 with selfsigned certifacte for localhost.
+
+# gwt command
+
+this is a helper which allows to setup a rails application with a GWT UI and helps to run some gwt specific commands.
+
+see [http://github.com/mkristian/rails-resty-gwt](http://github.com/mkristian/rails-resty-gwt) for more details.