add gitignore

Change-Id: I82545145efcbd73ef4fde2d6c5839d300062380b
diff --git a/draw9patch/.gitignore b/draw9patch/.gitignore
new file mode 100644
index 0000000..ee936c7
--- /dev/null
+++ b/draw9patch/.gitignore
@@ -0,0 +1,3 @@
+*.iml
+out
+.idea