add Arcane

[janwels89]

Repository link: https://github.com/getarcaneapp/arcane
Description: Arcane is designed to be an easy and modern Docker management platform, built with everybody in mind.
Author: https://github.com/getarcaneapp

Or directly write it:

[REPO](https://github.com/getarcaneapp/arcane) - Arcane is designed to be an easy and modern Docker management platform, built with everybody in mind. By [@AUTHOR](https://github.com/getarcaneapp)

[mashb1t]

LGTM and does fit the list. Feel free to create a PR and add it to the same category as Portainer.