Create CSSinJS brand colors

[georgewrmarshall]

Description:

We need to implement the brand colors in the design tokens package. The colors are defined as follows in the Brand Colors Figma Library

Technical Details:

1. Create a brandColor object that is accessible via the design-tokens package
2. Write tests to ensure the color object matches the design tokens.

Acceptance Criteria:

• The color object is correctly implemented in the design tokens package and can be imported.
• All tests pass, confirming the brandColor object matches the Figma design tokens.