When I feel content with it I will move it to the template namespace and add a site notice linking to it for a while, as I am not sure if you all look here or on [[Special:RecentChanges]].
Anyway here is my current draft (do not hesitate to add suggestions on its discussion page):
[[User:Johan G/Template:Welcome to the wiki ]]
—[[User:Johan G|Johan G]] ([[User_talk:Johan_G|Talk]] | [[Special:Contributions/Johan_G|contribs]]) 13:02, 15 April 2019 (EDT)
: Hi Johan,