PixelArtists Workflow. Mini-Guide method for optimal results

Added a new conversion process mini guide to get the best results.

It implies some manual edits but ends in a much better conversion giving you more freedom on colors.

1: Get Grey/Pixelated version from Pixatool *
2: Some manual edits / corrections
3: Colorize as wish
4: Profit!

* Here the process to get the Grey/Pixelated/Dither version