Add the method to fit the screen
updatet the example
add some depedencies to calc the terminal size
add peiqi example image
change the char width to 0.5
add example
remove some useless code
add new method to convert a image from filename directly
Update README.md
Update README.md
rename example images
Update README.md
add more ascii images
Update README
UPDATE README
add lufei ascii image
add example images
update README file
add convert package to convert a image to ascii matrix
update README file