Add .gitignore file

guowenxue

2023-07-24 50366b0031b549ddad589a066347610137f4eb83

Add .gitignore file

Signed-off-by: guowenxue <guowenxue@gmail.com>

 .gitignore

New file
@@ -0,0 +1,6 @@
# git ignore files/folders in the list

bootloader/
images/
kernel/
yocto/