Merge pull request #3949 from shaedrich/design-system

Add topic "Design system"

Author: ahpook

topics/design-system/index.md

@@ -0,0 +1,8 @@
+---
+display_name: Design system
+short_description: A design system is a way to have modular and reusable CSS components as well as a separation of concerns.
+topic: design-system
+related: css, design-token, style-guide, css-framework, ui, smacss
+wikipedia_url: https://en.wikipedia.org/wiki/Design_system
+---
+A **design system** is a way to have modular and reusable CSS components as well as a separation of concerns of designing and using this system, by, for examplr, using design tokens.