added instructions for how to build all child modules.

git-svn-id: https://svn.apache.org/repos/asf/struts/sandbox/trunk@1498476 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/struts2examples/ReadMe.txt b/struts2examples/ReadMe.txt
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+This Maven multi-module project contains all the Struts 2
+example applications that are part of the Getting Started
+Struts 2 tutorials at http://struts.apache.org.
+
+To build all the example applications run the Maven command:
+mvn -e clean package in the project's root folder.  Maven 
+will the build each module and create a .war file in the
+target sub-folder of each module.
+
+You can then copy the .war files to your Servlet container
+(e.g. Tomcat, Jetty, GlassFish, etc).
+
+There is a ReadMe.txt file in each module with instructions 
+the URL to view that application.
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