docs: Clarify that .jsh are not cached and no native support (fixes q…

…uarkusio#506) (quarkusio#511)

* docs: Clarify that .jsh are not cached and no native support (fixes quarkusio#506)

* Update readme.adoc

Co-authored-by: Max Rydahl Andersen <max.andersen@gmail.com>

readme.adoc

@@ -427,6 +427,8 @@ The script will have the output:
  Hello World
  value
 
+Please note that `.jsh` files are source only, they are not compiled thus they are https://github.com/jbangdev/jbang/issues/506[not cached] nor can they be https://github.com/jbangdev/jbang/issues/510[built as native images].
+
 
 ==== Running script from standard input