first commit
First commit
first commit
Use of struct
Division of functions, main and creation of first version of Makefile
Makefile modified
Corrected error in main. Variable "Namefile" in functions made constant.

In main: width_bw and height_bw have been replaced by width and height. width_small and height_small have been initialised with the values of width and height.
.cpp files created and added to Makefile. malloc/free changed into new/delete.
Use of references in functions ppm_read_from_file and ppm_shrink
Use of class img. Makefile and main modified consequently.
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