Update README.md

Update README.md

Update README.md

add some examples

update docker image

update the logic

fixed the lint issue

reformat the code

add the mock terminal

remove uesless files

Refactor the code to match the oop mode for easy mock and test

add the fit options to scale the image to fit the screen

Update README.md

Update the README.md

Fxied the fetched wrong image width and height issue

add reverse options

add convert examples

Revert "add parallel convert"

This reverts commit 6ee682ae1c41bfd64968d71334d72b52c8d29ca3.

add parallel convert

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