Markdown for Sharepoint

I am a non-programmer (until now). I want to have a Markdown Solution for Microsoft Sharepoint (online) to create a new and better working Wiki-App. What must happen (what has to be coded) to let this happen? The Sharepoint Online environment is a shared one and therefore the possibilities for (client site) code execution is limited. I would try to do this myself but at the moment I don’t know what to learn first and why.