add README

java/README

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+To build the JAR file of Message Pack, you need to install Maven (http://maven.apache.org), then type the following command:
+
+$ mvn package
+
+To locally install the project, type
+$ mvn install
+
+To generate project files (.project, .classpath) for Eclipse, do 
+
+$ mvn eclipse:eclipse
+
+then import the folder from your Eclipse. 
+
+Next, open the preference page in Eclipse and add the CLASSPATH variable:
+
+M2_REPO = $HOME/.m2/repository
+
+where $HOME is your home directory. In Windows XP, $HOME is:
+C:/Documents and Settings/(user name)/.m2/repository 
+
+
+# How to release the project (compile, test, tagging, deploy)
+
+$ mvn release:prepare
+$ mvn release:perform
+
+