chore: languages in README

Author: danil-pavlov

README.adoc

@@ -25,7 +25,7 @@ To manually initialize the project:
 
 . Navigate to https://start.spring.io.
 This service pulls in all the dependencies you need for an application and does most of the setup for you.
-. Choose either Gradle or Maven and the language you want to use.
+. Choose either Gradle or Maven and the language you want to use: Kotlin or Java.
 . Click *Dependencies* and select *Spring Data JPA* and then *H2 Database*.
 . Click *Generate*.
 . Download the resulting ZIP file, which is an archive of a web application that is configured with your choices.