Add Maven POM Data

I am going to use libhtmlparser-java in packaging the maven project filius. With the POM data added, building filius works fine after packaging one more dependency.

$ debdiff libhtmlparser-java_1.6.20060610.dfsg0-9_all.deb libhtmlparser-java_1.6.20060610.dfsg0-10_all.deb
[…]
Files in second .deb but not in first
-------------------------------------
-rw-r--r--  root/root   /usr/share/maven-repo/org/htmlparser/htmlparser/1.6/htmlparser-1.6.pom
-rw-r--r--  root/root   /usr/share/maven-repo/org/htmlparser/htmlparser/debian/htmlparser-debian.pom
lrwxrwxrwx  root/root   /usr/share/maven-repo/org/htmlparser/htmlparser/1.6/htmlparser-1.6.jar -> ../../../../../java/libhtmlparser-1.6.20060610.jar
lrwxrwxrwx  root/root   /usr/share/maven-repo/org/htmlparser/htmlparser/debian/htmlparser-debian.jar -> ../../../../../java/libhtmlparser-1.6.20060610.jar
[…]