Adding a README file

git-svn-id: https://svn.apache.org/repos/asf/servicemix/documentation/trunk@1023672 13f79535-47bb-0310-9956-ffa450edef68
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+## Prerequisites ##
+You need to have these two programs installed on your machine:
+
+- [Pygments] - syntax highlighting for HTML and PDF (http://pygments.org/)
+- [Prince XML] - converts HTML into PDF for the manual (http://www.princexml.com/)
+
+## Building SNAPSHOT dependencies ##
+This project depends on a few SNAPSHOT dependencies.  Before you start working on the docs, you need to checkout and build these two projects locally:
+
+- [http://github.com/jstrachan/maven-scala-plugin](http://github.com/jstrachan/maven-scala-plugin)
+- [http://github.com/scalate/scalate](http://github.com/scalate/scalate)
+
+## Building the documentation project ##
+There are two ways of building the documentation project:
+
+- `mvn -Plive jetty:run` will make a live website copy available [locally](http://localhost:8080).  This is very convenient while editing the docs to quickly review the changes you made.
+- `mvn clean install` will build the documentation project, creating 3 representations:
+  - a war file containing the documentation webapp
+  - a pdf file (in `target/sitegen/manual.pdf`)
+  - a static website, generated using the same templates (in `target/sitegen`)
+  
+## Known issues ##
+
+- The war file currently can't be deployed on ServiceMix
+
+