Add zenn

[ryoppippi]

Name with link

https://zenn.dev
guideline: https://zenn.dev/mediakit
download link: https://static.zenn.studio/images/mediakit/zenn-logo.zip

Description
zenn is a Japanese media for developers, like dev.to
Link to the vector file, preferably from an official source

[gilbarbara]

Hey @ryoppippi
We usually don't add regional tools since a website in japanese wouldn't mean anything to most users.

Thanks