Add .gitignore Git configuration file.

.gitignore

@@ -1,12 +1,26 @@
-*.class
+.DS_Store
+bin/
+build/
+out/
+target/
+.gradle
+.springBeans
+*.iml
+*.ipr
+*.iws
+*.log
+.classpath
+.project
+.settings/
+.idea/
+_site/
+.bak/
+*.dat
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
+/samples/hello-world/vf.gf.dmn-events.cfg
+/samples/hello-world/vf.gf.dmn-license.cfg
+/vf.gf.dmn-events.cfg
+/vf.gf.dmn-events.txt
+/vf.gf.dmn-license.cfg
 
-# Package Files #
-*.jar
-*.war
-*.ear
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+/BACKUP*