[doc] Update with build details for libraries

Author: adamretter

README.md

@@ -6,33 +6,17 @@
 **NOTE:** This is a fork and advancement of the code taken from [fgeorges/expath-pkg-java](https://github.com/fgeorges/expath-pkg-java). Unfortunately we were unable to get changes via PR upstreamed, so we have forked the project here.
 
 Implementation of the EXPath [Packaging System](http://expath.org/modules/pkg/)
-for Java, Saxon and Calabash.
+for Java.
 
 
 ## Installation
 
-Download the latest `expath-repo-installer-x.y.z.jar` file from the
-[download area](http://expath.org/files) and execute it by
-double-clicking on it (or from the command-line: `java -jar
-expath-repo-installer-x.y.z.jar`).  Follow the instructions, that's
-it!
+* Requires:
+    * Apache Maven 3+
+    * Java JDK 8+
 
-If you don't want a graphical installer, use the latest
-`expath-repo-x.y.z.zip` file instead.  Unzip it and set it up.
+```
+$ mvn clean package
+```
 
-
-## Setup
-
-Add the script `xrepo` to your PATH.  To create an EXPath package
-repository, simply use: `xrepo create <repo-dir>`.  You can set the
-environment variable `EXPATH_REPO` if you don't want to provide the
-repository directory everytime you use `xrepo`.
-
-For more information on the repository manager: `xrepo help`.
-
-The install directory contains also a script `saxon` and a script
-`calabash`, that launch resp. Saxon and Calabash, by configuring them
-with the repository, and adding useful options from the command line.
-For more information: `saxon --help` and `calabash ++help`, or see the
-[README](https://github.com/fgeorges/expath-pkg-java/tree/master/bin)
-file in the sub-directory `bin/` in the source repository.
+Compiled artifacts are in the relevant `target/` folders.