add helloworld scala

Author: GuillaumeDupuy

Scala/helloV2.scala

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+object HelloWorld {
+  def main(args: Array[String]): Unit = {
+    println("Hello, World!")
+  }
+}

Scala/helloV3.scala

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+@main def HelloWorld(args: String*): Unit =
+  println("Hello, World!")

Scala/readme.md

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+# Scala Hello World
+
+Scala combines object-oriented and functional programming in one concise, high-level language. Scala's static types help avoid bugs in complex applications, and its JVM and JavaScript runtimes let you build high-performance systems with easy access to huge ecosystems of libraries.
+
+# run the program
+
+you need to install Scala .
+
+you can found how to install Scala at: [https://www.scala-lang.org/download/](https://www.scala-lang.org/download/)
+
+for run the program, you can use the command for compiling :
+
+```
+scalac helloV2.scala
+```
+
+and run this command to running
+
+```
+scala -classpath . HelloWorld
+```