Add gen/ to .gitignore

fixes: 139187793
Change-Id: I8cf63f177aa8303d71b926645fa274e9fce55b47
diff --git a/.gitignore b/.gitignore
index 481c592..c47cc8b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea
 *.iml
 *.sw*
+gen/
\ No newline at end of file