Update README.md to include ISO Codes metadata for available languages

Hugging Face: https://huggingface.co/languages
Wiki: https://en.wikipedia.org/wiki/Kom_language_(Cameroon)
Glottolog: https://glottolog.org/resource/languoid/id/komc1235

README.md

@@ -3,4 +3,7 @@ task_categories:
 - translation
 size_categories:
 - n<1K
+language:
+- en
+- bkm
 ---