feat: add (sample) primary/secondary colors

[cguedes]

• [Discussion] Tailwind CSS configurations and rules #41

This PR adds (sample) primary and secondary colors (with hover variant) to the project.

Colors	Primary hover	Secondary hover

[cguedes]

Updated with CSS variables and adjusted colors (configured using HSV)

    --color-primary: 151deg 54% 69%;
    --color-primary-hover: 152deg 54% 48%;
    --color-secondary: 193deg 37% 69%;
    --color-secondary-hover: 193deg 37% 48%;