Initial secure commit

.gitignore

build.sbt

project/build.properties

project/plugins.sbt

src/main/scala/com/example/JsonSupport.scala

src/main/scala/com/example/QuickstartServer.scala

src/main/scala/com/example/UserRegistryActor.scala

src/main/scala/com/example/UserRoutes.scala

src/test/scala/com/example/UserRoutesSpec.scala