Add Primer topic

topics/primer/index.md

@@ -0,0 +1,12 @@
+---
+created_by: GitHub
+display_name: Primer
+github_url: https://github.com/primer
+logo: primer.png
+related: primer-css, design-system, component-library
+released: 2016
+short_description: The design system that powers GitHub.
+topic: primer
+url: https://primer.style
+---
+Primer is the design system created for GitHub by GitHub. The GitHub Design Infrastructure team builds and maintains Primer — this includes the CSS framework, style guide documentation, Octicons, numerous tools and libraries that support design and front-end, and more. With Primer being open source, its allowed the community to design and build their own projects with Primer.