adding backend project

will try to do rest & websocket api with http4s

build.sbt

@@ -1,10 +1,14 @@
 import org.scalajs.linker.interface.ModuleSplitStyle
 
-lazy val planningPokerGrargh = project
-  .in(file("."))
+lazy val commonSettings = Seq(
+  scalaVersion := "3.2.0"
+)
+
+lazy val frontend = project
+  .in(file("frontend"))
   .enablePlugins(ScalaJSPlugin) // Enable the Scala.js plugin in this project
   .settings(
-    scalaVersion := "3.2.0",
+    commonSettings,
 
     // Tell Scala.js that this is an application with a main method
     scalaJSUseMainModuleInitializer := true,
@@ -29,3 +33,27 @@ lazy val planningPokerGrargh = project
     libraryDependencies += "org.scala-js" %%% "scalajs-dom" % "2.4.0",
     libraryDependencies += "com.raquo" %%% "laminar" % "15.0.1"
   )
+  .dependsOn(common)
+
+lazy val backend = project
+  .in(file("backend"))
+  .settings(
+    commonSettings,
+    libraryDependencies ++= Seq(
+      "org.http4s" %% "http4s-ember-client" % http4sVersion,
+      "org.http4s" %% "http4s-ember-server" % http4sVersion,
+      "org.http4s" %% "http4s-dsl" % http4sVersion
+    ),
+    // available for 2.12, 2.13, 3.2
+    libraryDependencies += "co.fs2" %% "fs2-core" % "3.6.1",
+    libraryDependencies += "org.typelevel" %% "cats-core" % "2.9.0",
+    libraryDependencies += "org.typelevel" %% "cats-effect" % "3.4.9"
+  )
+  .dependsOn(common)
+
+val http4sVersion = "1.0.0-M39"
+lazy val common = project
+  .in(file("common"))
+  .settings(
+    commonSettings
+  )