Add CLI Interface

[Shynixn]

TODOS:

• Carefully think about what kind of requirements we need
• Implement it in the main.py file

Some sample requirements are:

• Converting multiple images
• Converting folders with images
• Converting images with background colors
• Converting images for blackboard
• ...

EDIT:
Bestes Pattern:
https://en.wikipedia.org/wiki/Command_pattern

Commands:

- whitebrush [options...] <files...>
Default command. Converts the given files and folders (with 1 deepness) and generates files appends _brushed before the extension.
- whitebrush --recursive (-r)
Converts the given files and folders (with endless deepness).
- whitebrush --convert (-c)
Replaces all files instead of adding the default _brushed name.
-whitebrush --mask (-m) <{name}mybrushedimage{extension}>
Changes the default added _brushed to the given text which isn't the placeholder {name} and extension.
-whitebrush --background(-b) < HTML ColorCode>
Converts the background to the given color code.
-whitebrush --forground(-f) < HTML ColorCode>
Converts the forground to the given color code.
-whitebrush --template (-t) <blackboard/whiteboard/note>
Converts the forground and background to the color code templates.
whitebrush --help (-h)
Displays the help page.

Requirements:

• All options should be specifiable in one command
• When using background or forground changes the last specified parameter should be used