I have a small bash script to help with that:
if [[ $1 = "post" ]]; then
#statements
# POSTS
export SLUG=$2
DATE=`date "+%Y-%m-%d"`
hugo new post/$DATE-$SLUG/index.md
mkdir -p content/post/$DATE-$SLUG/gallery;
mkdir -p content/post/$DATE-$SLUG/images/;
open content/post/$DATE-$SLUG/; subl content/post/$DATE-$SLUG/; cd content/post/$DATE-$SLUG/;
fi
The usage is ./new post $title