Create [ActivitySummary] component

[poroia]

Create an [ActivitySummary] component that will give a summary on a particular Activity.

-This will eventually be connected to our API but for now, we'll focus on building out the visual aspects.

• You would probably need to utilize the AvatarGroup under src/components/shared/high to create the avatars. See an example usage under src/components/Student/Dashboard/Journey/Floating.js. This component requires names for the AvatarGroup which may not have been built yet. See Modify [AvatarGroup] to display Names #19.

The component is under the Explore, World, and Module pages under Student View on the Figma.

For now, place this component under src/components/shared/high