feat #38: Problem 응답 dto 구성

- 타입, 문제, 정답 반환

src/main/java/com/syu/capsbe/domain/problem/dto/response/ProblemResponseDto.java

@@ -0,0 +1,22 @@
+package com.syu.capsbe.domain.problem.dto.response;
+
+import com.syu.capsbe.domain.problem.Problem;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+public class ProblemResponseDto {
+
+    private final String problemType;
+
+    private final String question;
+
+    private final String answer;
+
+    public static ProblemResponseDto of(Problem problem) {
+        return new ProblemResponseDto(problem.getProblemType().name(), problem.getQuestion(),
+                problem.getAnswer());
+    }
+}