add gitignore
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..38d273e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+target
+.classpath
+.project
+.settings
+.idea
+*.iml
+lib
+offline
+*.patch