#428 Migration to GitHub

[Neustradamus]

Dear Alt-F team, @jcard,

It is possible to add the code on GitHub to have a best developement, visibility, contributions, ...

After, you can add a "move" box like https://sourceforge.net/projects/handbrake for example.

Example, WinMerge is now here, after several places and the developement is good:
- https://github.com/winmerge

Thanks in advance.