Add HomeController and initial application setup with routing

knockoutwhistweb/app/controllers/HomeController.scala

@@ -0,0 +1,34 @@
+package controllers
+
+import javax.inject._
+import play.api._
+import play.api.mvc._
+import de.knockoutwhist.KnockOutWhist
+
+/**
+ * This controller creates an `Action` to handle HTTP requests to the
+ * application's home page.
+ */
+@Singleton
+class HomeController @Inject()(val controllerComponents: ControllerComponents) extends BaseController {
+
+  private var initial = false
+
+  /**
+   * Create an Action to render an HTML page.
+   *
+   * The configuration in the `routes` file means that this method
+   * will be called when the application receives a `GET` request with
+   * a path of `/`.
+   */
+  def index() = {
+    if (!initial) {
+      initial = true
+      KnockOutWhist.main(new Array[String](_length = 0))
+    }
+    Action { implicit request: Request[AnyContent] => {
+      Ok(views.html.main.render("KnockoutWhist", views.html.index.apply()))
+    }
+    }
+  }
+}