Add link back to this github

[jidanni]

http://www.sammyshp.de/fsmap/ needs a link somewhere, back to https://github.com/SammysHP/fsmap/ !

1. Now becomes Open Source, as users can find the source! In fact I bet those are the rules of GitHub too.
2. Users can finally read what the site is trying to accomplish, right there on README.md.
3. Users finally find the place to report bugs.

[SammysHP]

In fact I bet those are the rules of GitHub too.

No.

[jidanni]

(Indeed https://docs.github.com/en/github/site-policy/github-community-guidelines includes closed source. You are right.)

[SammysHP]

Just because something is not on GitHub doesn't mean it's not open source. Actually you have all the source of fsmap on your computer when you visit the site.