[Doc] Add Ktor Repository (#1)

Author: hopeman15

README.md

@@ -36,4 +36,5 @@ Try to produce something that is at least minimally functional. Part of the exer
 
 | Tech Stack | CI Integration | Challenge |
 |--|--|--|
-| Python & Django | Yes | [Repository →](https://github.com/Thermondo/backend-code-challenge-django) |
+| Python & Django | Yes | [Repository →](https://github.com/Thermondo/backend-coding-challenge-django) 
+| Kotlin & Ktor | Yes | [Repository →](https://github.com/Thermondo/backend-coding-challenge-ktor)