[Added] Tests and some more functionality to the Services

backend/.devcontainer/devcontainer.json

@@ -5,7 +5,7 @@
     "context": "..",
     "dockerfile": "../Dockerfile",
     "args": {
-      "WORKDIR": "/app",
+      "WORKDIR": "/app"
       // "UID": "${localEnv:USER_UID}",
       // "GID": "${localEnv:USER_GID}"
     },
@@ -24,7 +24,8 @@
       "settings": {},
       "extensions": [
         "vscjava.vscode-java-pack",
-        "Oracle.oracle-java"
+        "Oracle.oracle-java",
+        "scala-lang.scala"
       ]
     }
   }