Move 'sandbox/scalajs/hello.scala' to 'sandbox/scalajs/src/main/scala/hello.scala' to fix an ensime error. After this change, `sbt ensimeConfig` works.

The ensime error message:
```
[error] You have .scala files in the base of your project. Such "script style" projects
[error] are not supported by ENSIME. Simply move them into src/main/scala to get support.
[error] Please read https://github.com/ensime/ensime-server/issues/1432
```

1 files changed, 15 insertions, 0 deletions

diff --git a/sandbox/scalajs/src/main/scala/hello.scala b/sandbox/scalajs/src/main/scala/hello.scala
new file mode 100644
index 000000000..bd4aa8cc5
--- /dev/null
+++ b/sandbox/scalajs/src/main/scala/hello.scala
@@ -0,0 +1,15 @@
+package hello
+
+import scala.scalajs.js
+
+trait MyTrait {
+  val x = 5
+  def foo(y: Int) = x
+}
+
+object world extends js.JSApp with MyTrait {
+  def main(): Unit = {
+    println("hello dotty.js!")
+    println(foo(4))
+  }
+}