[Added] Tests and some more functionality to the Services

backend/src/main/java/com/ninjaws/quiz/models/Answers.java

@@ -0,0 +1,17 @@
+package com.ninjaws.quiz.models;
+
+import java.util.List;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class Answers {
+    private final String sessionId;
+    private List<String> answers;
+
+    public Answers(String sessionId) {
+        this.sessionId = sessionId;
+    }
+}