Add the Chart color palette and related guideline

[Cuervino]

Component:

color, or a dedicated MDX page

Why this is needed:

Specific colors are used for charts lines or bars.

What should be done:

Having a guideline that is explaining what color to select, depending on the use case.

Implementation proposal (strongly recommended):

Explaining the use cases

• Type of chart,
• Meaning of data (positive, neutral),
• Number of lines

Test plan: