Add a swift playground with a couple pages of examples.

Authored by featherless on Wed, Mar 15, 1:51 PM.

Description

Add a swift playground with a couple pages of examples.

Reviewers: O2 Material Motion, O4 Material Apple platform reviewers, Material Motion, chuga

Reviewed By: O4 Material Apple platform reviewers, chuga

Tags: Material Motion

Differential Revision: http://codereview.cc/D2880