French Translation of the Introduction (01_Basic/10_Introduction)

I made a french translation of the Introduction Part, located in the 01_Basic/10_Introduction directory.
I used the same pattern as the /00_preamble.lhs file, putting "en: " before each english line and "fr: " before each french line (and letting nothing before code line, of course).
I hope that I made a good work (and made no mistakes with the pattern).

The other parts will follow :).