feat: project to play with simpler fragments

my problem was - thinking that th:fragment is not rendered
but it is, and i get null poniter error, because argument is not there

the object under name used in fragment should already be available, for
example take out of th:each

troubleshooting-thymeleaf-scala/build.sbt

@@ -0,0 +1,9 @@
+
+val toolkitV = "0.1.7"
+val toolkit = "org.scala-lang" %% "toolkit" % toolkitV
+val toolkitTest = "org.scala-lang" %% "toolkit-test" % toolkitV
+
+ThisBuild / scalaVersion := "3.2.2"
+libraryDependencies += toolkit
+libraryDependencies += (toolkitTest % Test)
+libraryDependencies +=      "org.thymeleaf" % "thymeleaf" % "3.1.1.RELEASE"