Add some docs about PIL / Pillow (ref #22).
Add some docs about PIL / Pillow (ref #22).

xouillet/sigal,jdn06/sigal,elaOnMars/sigal,Ferada/sigal,kontza/sigal,cbosdo/sigal,xouillet/sigal,t-animal/sigal,cbosdo/sigal,jdn06/sigal,kontza/sigal,franek/sigal,kontza/sigal,muggenhor/sigal,jasuarez/sigal,t-animal/sigal,Ferada/sigal,saimn/sigal,jasuarez/sigal,Ferada/sigal,xouillet/sigal,jasuarez/sigal,cbosdo/sigal,jdn06/sigal,franek/sigal,saimn/sigal,elaOnMars/sigal,t-animal/sigal,muggenhor/sigal,saimn/sigal