BAEL-18214 moved build.sbt file to the top of hierarchy

Author: dkapil

core-scala/build.sbt renamed to build.sbt

@@ -1,9 +1,9 @@
-	ThisBuild / scalaVersion     := "2.12.7"
+ThisBuild / scalaVersion     := "2.12.7"
 ThisBuild / version          := "1.0-SNAPSHOT"
 ThisBuild / organization     := "com.baeldung"
 ThisBuild / organizationName := "core-scala"
 
-lazy val root = (project in file("."))
+lazy val root = (project in file("core-scala"))
   .settings(
     name := "core-scala",
     libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.5" % Test,