Add Design Principles (sindresorhus#1045)

readme.md

@@ -569,6 +569,7 @@
 - [Uncopyright](https://github.com/johnjago/awesome-uncopyright) - Public domain works.
 - [Crypto Currency Tools & Algorithms](https://github.com/kennethreitz/awesome-coins) — Digital currency where encryption is used to regulate the generation of units and verify transfers.
 - [Open Source Supporters](https://github.com/zachflower/awesome-open-source-supporters) - Companies that offer their tools and services for free to open source projects.
+- [Design Principles](https://github.com/robinstickel/awesome-design-principles) - Create better and more consistent designs and experiences.
 
 
 ## License