Add command-line exemples to the README

[ngirard]

The animated screencasts shown in the README (despite not displaying properly on Firefox on my machine) are descriptive and to the point.

Admittedly the next step in discovering and evaluating your project consists in running it on its own machine ; and this step is currently made uncomfortable to achieve because the proposed command line examples cannot be copied a pasted from the README.

I'd thus suggest adding them to the README.