Add documentation

README.md

@@ -1,3 +1,11 @@
 # EOA eXist app
 
 An app for the eXist XML database for easier distribution.
+
+## Deployment
+
+In order to build and deploy this app, `ant` is required. After you made changes to the code, change into the `app` directory and run
+
+    ant
+
+which is a Makefile and will create a `xar` package in the `releases` directory. This `xar` file can then be deployed in the `eXist` database.