Add Timeline component
The overall component is split into smaller components:
* Timeline item: an individual item (event) for the timeline.
* Timeline group: a group of items grouped according to props.
See README.md for prop details.
Ordering and grouping is decided via props. Component also
exports helper objects to make it easier to pass in the correct
props for ordering and grouping.
Item titles and bodies can be passed in as either strings or
React elements. Icons must be React elements.
Has a storybook scenario along with unit and snapshot tests.
Co-authored-by: Valerie K <valerie@automattic.com>
Co-authored-by: Allen Snook <allen@allendav.com>
Co-authored-by: Kristófer R <kristofer.thorlaksson@automattic.com>
Co-authored-by: David Levin <davidlevin@Davids-MacBook-Pro-2.local>
Valerie K