added an introduction to Artifact API
added an introduction to Artifact API

git-svn-id: d3061b52f177ba403f02f0a296a85518da96c313@1391847 13f79535-47bb-0310-9956-ffa450edef68

barthel/maven,kidaa/maven-1,olamy/maven,mcculls/maven,dsyer/maven,njuneau/maven,karthikjaps/maven,cstamas/maven,pkozelka/maven,keith-turner/maven,rogerchina/maven,changbai1980/maven,keith-turner/maven,gorcz/maven,vedmishr/demo1,changbai1980/maven,likaiwalkman/maven,wangyuesong0/maven,olamy/maven,atanasenko/maven,wangyuesong0/maven,kidaa/maven-1,dsyer/maven,changbai1980/maven,wangyuesong0/maven,vedmishr/demo1,cstamas/maven,ChristianSchulte/maven,stephenc/maven,likaiwalkman/maven,kidaa/maven-1,runepeter/maven-deploy-plugin-2.8.1,cstamas/maven,lbndev/maven,Mounika-Chirukuri/maven,skitt/maven,lbndev/maven,apache/maven,rogerchina/maven,ChristianSchulte/maven,lbndev/maven,gorcz/maven,dsyer/maven,atanasenko/maven,apache/maven,aheritier/maven,mizdebsk/maven,rogerchina/maven,xasx/maven,mizdebsk/maven,aheritier/maven,wangyuesong/maven,pkozelka/maven,barthel/maven,aheritier/maven,likaiwalkman/maven,njuneau/maven,Mounika-Chirukuri/maven,stephenc/maven,wangyuesong/maven,trajano/maven,atanasenko/maven,Tibor17/maven,mcculls/maven,apache/maven,josephw/maven,mcculls/maven,wangyuesong/maven,ChristianSchulte/maven,olamy/maven,mizdebsk/maven,xasx/maven,xasx/maven,skitt/maven,Distrotech/maven,pkozelka/maven,vedmishr/demo1,josephw/maven,trajano/maven,josephw/maven,njuneau/maven,Mounika-Chirukuri/maven,gorcz/maven,runepeter/maven-deploy-plugin-2.8.1,stephenc/maven,barthel/maven,karthikjaps/maven,trajano/maven,karthikjaps/maven,Tibor17/maven,skitt/maven,Distrotech/maven,keith-turner/maven