create configuration for rust projects

[ifiokjr]

Description

For cargo projects, the configuration for skribble should happen in the build.rs file.

Tasks

• create configuration for keyframes #5
• create configuration for breakpoints #6
• create configuration for mediaQueries #7
• create configuration for parentModifiers #8
• create configuration for modifiers #9
• create configuration for colors #10
• create configuration for cssVariables #11
• create configuration for atoms #12
• create configuration for styleRules #13
• create configuration for classes #14
• create configuration for palette #15
• create configuration for groups #16
• create configuration for plugins #17
• create configuration for custom #18
• create configuration for @container #19
• generate css from captured class names #20
• allow other json fields in config #21