Please add a wiki page on installation (and possibly deinstallation)

[prof-spock]

Dear all,

the current wiki starts with a quick start guide assuming that the product has already been installed. But typically the first step in using a product is its installation.

So could you kindly add a page about the installation and deinstallation of Modelio on the supported platforms? This page should also address command line options for the installer and uninstaller like e.g. "/S" in Windows. It seems that this information is not yet to be found elsewhere and as far as I can tell the repository also does not contain the source code for the installers (does it?).

This would also handle issues like #47 or #69 where people could not find how to use the installer or uninstaller and obviously resorted to playing around with the command line...

Best regards, Prof. Spock