OPENNLP-64 Added section about training api and evaluation.
OPENNLP-64 Added section about training api and evaluation.

git-svn-id: 924c1ce098d5c0cf43d98e06e1f2b659f3b417ce@1065721 13f79535-47bb-0310-9956-ffa450edef68

jzonthemtn/opennlp,jzonthemtn/opennlp,ragerri/opennlp,apache/opennlp,apache/opennlp,apache/opennlp,jzonthemtn/opennlp,ragerri/opennlp,ragerri/opennlp