Add test folder

Fix typo in README

README.md

@@ -13,7 +13,7 @@ More specifically:
 * instructions to get this repository locally are available in the [Create a SpinalHDL project](https://spinalhdl.github.io/SpinalDoc-RTD/master/SpinalHDL/Getting%20Started/Install%20and%20setup.html#create-a-spinalhdl-project) section.
 
 
-### TL;DR Things have arleady been set up in my environment, how do I run things to try SpinalHDL?
+### TL;DR Things have already been set up in my environment, how do I run things to try SpinalHDL?
 
 Once in the `SpinalTemplateSbt` directory, when tools are installed, the commands below can be run to use `sbt`.
 

build.sbt

@@ -10,6 +10,7 @@ val spinalIdslPlugin = compilerPlugin("com.github.spinalhdl" %% "spinalhdl-idsl-
 lazy val projectname = (project in file("."))
   .settings(
     Compile / scalaSource := baseDirectory.value / "hw" / "spinal",
+    Test / scalaSource := baseDirectory.value / "test" / "spinal",
     libraryDependencies ++= Seq(spinalCore, spinalLib, spinalIdslPlugin)
   )