Add Indie (sindresorhus#992)

Author: mezod

readme.md

@@ -431,6 +431,7 @@
 - [Open Companies](https://github.com/opencompany/awesome-open-company)
 - [Places to Post Your Startup](https://github.com/mmccaff/PlacesToPostYourStartup)
 - [OKR Methodology](https://github.com/domenicosolazzo/awesome-okr) - Goal setting & communication best practices.
+- [Indie](https://github.com/mezod/awesome-indie) - Independent developer businesses.
 
 
 ## Work