scala: add page (#1755)

pages/common/scala.md

@@ -0,0 +1,19 @@
+# scala
+
+> Scala application launcher and interactive interpreter.
+
+- Start a Scala interactive shell (REPL):
+
+`scala`
+
+- Execute a Scala script:
+
+`scala {{script.scala}}`
+
+- Execute a .jar program:
+
+`scala {{filename.jar}}`
+
+- Execute a single Scala command in the command line:
+
+`scala -e {{command}}`