Update README.md

Author: connor11528

README.md

@@ -92,6 +92,8 @@ Thanks for stopping by
 
 ## Services
 
+- **exercism** - https://exercism.io/ - Level up your programming skills with 2,629 exercises across 48 languages, and insightful discussion with our dedicated team of welcoming mentors. Exercism is 100% free forever.
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 - **codewars** - https://www.codewars.com/ - Codewars has thousands of questions generated by the community. You'll never run out of practice problems. They're organized by difficulty, concept and programming language.
 
 - **codefights** - https://codefights.com/ - Really great user interface and user experience. I like the gamification and points system they have going on.