Adds instructions on how to build and run this codebase.

README.md

@@ -4,6 +4,11 @@ OpenExchange - OpenXDS - With ODD support
 
 This is a forked version of the [original OpenXDS](https://www.projects.openhealthtools.org/sf/projects/openxds/) with added support for [the on-demand documents option](http://wiki.ihe.net/index.php?title=ITI_On-Demand_Documents). These additions were done to enable the use of OpenXDS as an XDS registry for the [OpenSHR project](https://github.com/jembi/openshr) which is a reference tool for [OpenHIE](http://ohie.org/).
 
+Building and running
+--------------------
+
+To build this code base you need to copy the folder in the `m2repo` directory to your maven repository (`<user_home>.m2/`). Then run `mvn clean install`. This will produce a `build` folder that contains an openxds .jar file which you can run with `java -jar openxds-1.1.0-SNAPSHOT.jar`.
+
 What is it?
 -----------