Restructured the folder structure of the library and tests targets to start development.

Package.swift

@@ -49,6 +49,6 @@ let package = Package(
 
 enum MarvelService {
     static let package = "marvel-service"
-    static let target = "AmiiboMarvelService"
+    static let target = "MarvelService"
     static let test = "\(MarvelService.target)Tests"
 }