Add License informations.
Add License informations.

Pythran is released as an open source software and the copyrights are
held by both HPC Project and Serge Guelton.

serge-sans-paille/pythran,hainm/pythran,pbrunet/pythran,hainm/pythran,pombredanne/pythran,artas360/pythran,hainm/pythran,artas360/pythran,pbrunet/pythran,artas360/pythran,pbrunet/pythran,pombredanne/pythran,serge-sans-paille/pythran,pombredanne/pythran