refacto palette, new method create an instance of Palette, add generate method that recieves options like template and rgb range colors, add sample_color method to return sample of color of the range
print to html all the colors of the palette
refactor color class, initialize color with hexadecimal string code or rgb array, add method to_s to print like string in html and add methods to convert values
palette sample color return an instance of color
Merge branch 'feature-RefactorPalette' into develop