Refactor rename the PixelASCII to CharPixel

fixed the go lint issue

Add method to support convert image to pixelASCII matrix

fixed the lint issue

reformat the code

remove uesless files

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

add reverse options

add Example

Add if colored the char test

Add ascii package test cases

Add ascii package test case

Rewrite the go docs

add colored the asicc output

add ascii package to convert a image pixel to ascii