[FEATURE] Allow users to specify custom colors in options object

[sandypockets]

Is your feature request related to a problem? Please describe.

• No

Describe the solution you'd like

• Users should be able to specify primary and secondary colors via a property in the options object.
• hex and rgb formats should be accepted.

Describe alternatives you've considered

• Providing default themes could be an option, and can be nice out of the box, but does not keep in line with the goal of customizability first.

Additional context

Example:

const options = {
  primaryColor: #000,
  accentColor: #fff
};