feat(user-sessions): implement user login, logout, and session management

knockoutwhistweb/app/logic/user/impl/BaseSessionManager.scala

@@ -0,0 +1,28 @@
+package logic.user.impl
+
+import com.typesafe.config.Config
+import logic.user.SessionManager
+import model.users.User
+
+import javax.inject.{Inject, Singleton}
+
+@Singleton
+class BaseSessionManager @Inject()(val config: Config) extends SessionManager {
+  
+  override def createSession(user: User): String = {
+    //TODO create JWT token instead of random string
+    //Write session identifier to cache and DB
+    val sessionId = java.util.UUID.randomUUID().toString
+    sessionId
+  }
+
+  override def getUserBySession(sessionId: String): Option[User] = {
+    //TODO verify JWT token instead of looking up in cache
+    //Read session identifier from cache and DB
+    None
+  }
+
+  override def invalidateSession(sessionId: String): Unit = {
+    
+  }
+}