cleanup...
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..84914ec
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,21 @@
+# use glob syntax.
+syntax: glob
+*.class
+*~
+*.bak
+*.off
+*.old
+.DS_Store
+
+# building
+target
+
+# Eclipse
+.classpath
+.project
+.settings
+
+# IDEA
+*.iml
+*.ipr
+*.iws