Add Documentation for first time library users

• Make sure the Readme is nicely formatted for npm and readable for first time library users.

Contents should be:

• List of usable components (or a reference to storybook?)
• How to install our component library
• How to import @linguala/ui-components and components into your project (modules & commonjs differences)
• How to integrate Themes
• How to integrate Global Styles, Fonts
• How to integrate Images / Icons
• Update the example on a sandbox and make it clear people can test it there as well without having to install any software