Add Kotlin implementation

Added: [Kotlin] `multicodec` is part of Kotlin project `multiformat`

Author: erwin-kok

README.md

@@ -78,6 +78,8 @@ The `validate.py` script can be used to validate the table once it's edited.
 - [Scala](https://github.com/fluency03/scala-multicodec)
 - [Ruby](https://github.com/sleeplessbyte/ruby-multicodec)
 - [Java](https://github.com/richardbergquist/java-multicodec)
+- Kotlin
+  - `multicodec` part of Kotlin project [multiformat](https://github.com/erwin-kok/multiformat)
 - [Add yours today!](https://github.com/multiformats/multicodec/edit/master/table.csv)
 
 ## Reserved Code Ranges