[BE/#17] Feat : 이슈 목록 관련 VO 추가 (UserVO, MilestoneVO, LabelVO)

- UserSummary : Author, Assignees 등 유저 정보를 다루는 VO 역할
- MilestoneSummary : 마일스톤에 대한 간략 정보를 다루는 VO
- LabelDetails : 레이블에 대한 정보를 담고 있는 VO (도메인과 중복되어 역할에 대한 고민이 더 필요)

BE/src/main/java/com/codesquad/issuetracker/ragdoll/dto/UserVO/UserSummary.java

@@ -0,0 +1,46 @@
+package com.codesquad.issuetracker.ragdoll.dto.UserVO;
+
+public class UserSummary {
+
+    private Long userId;
+
+    private String userName;
+
+    private String avatarUrl;
+
+    public UserSummary() {}
+
+    private UserSummary(Long userId, String userName, String avatarUrl) {
+        this.userId = userId;
+        this.userName = userName;
+        this.avatarUrl = avatarUrl;
+    }
+
+    public static UserSummary create(Long userId, String userName, String avatarUrl) {
+        return new UserSummary(userId, userName, avatarUrl);
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Long userId) {
+        this.userId = userId;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public void setUserName(String userName) {
+        this.userName = userName;
+    }
+
+    public String getAvatarUrl() {
+        return avatarUrl;
+    }
+
+    public void setAvatarUrl(String avatarUrl) {
+        this.avatarUrl = avatarUrl;
+    }
+}

BE/src/main/java/com/codesquad/issuetracker/ragdoll/dto/labelVO/LabelDetails.java

@@ -0,0 +1,46 @@
+package com.codesquad.issuetracker.ragdoll.dto.labelVO;
+
+public class LabelDetails {
+
+    private Integer labelId;
+
+    private String labelName;
+
+    private String hexCode;
+
+    public LabelDetails() {}
+
+    private LabelDetails(Integer labelId, String labelName, String hexCode) {
+        this.labelId = labelId;
+        this.labelName = labelName;
+        this.hexCode = hexCode;
+    }
+
+    public static LabelDetails create(Integer labelId, String labelName, String hexCode) {
+        return new LabelDetails(labelId, labelName, hexCode);
+    }
+
+    public Integer getLabelId() {
+        return labelId;
+    }
+
+    public void setLabelId(Integer labelId) {
+        this.labelId = labelId;
+    }
+
+    public String getLabelName() {
+        return labelName;
+    }
+
+    public void setLabelName(String labelName) {
+        this.labelName = labelName;
+    }
+
+    public String getHexCode() {
+        return hexCode;
+    }
+
+    public void setHexCode(String hexCode) {
+        this.hexCode = hexCode;
+    }
+}

BE/src/main/java/com/codesquad/issuetracker/ragdoll/dto/milestoneVO/MilestoneSummary.java

@@ -0,0 +1,35 @@
+package com.codesquad.issuetracker.ragdoll.dto.milestoneVO;
+
+public class MilestoneSummary {
+
+    private Integer milestoneId;
+
+    private String milestoneTitle;
+
+    public MilestoneSummary() {}
+
+    public MilestoneSummary(Integer milestoneId, String milestoneTitle) {
+        this.milestoneId = milestoneId;
+        this.milestoneTitle = milestoneTitle;
+    }
+
+    public static MilestoneSummary create(Integer milestoneId, String milestoneTitle) {
+        return new MilestoneSummary(milestoneId, milestoneTitle);
+    }
+
+    public Integer getMilestoneId() {
+        return milestoneId;
+    }
+
+    public void setMilestoneId(Integer milestoneId) {
+        this.milestoneId = milestoneId;
+    }
+
+    public String getMilestoneTitle() {
+        return milestoneTitle;
+    }
+
+    public void setMilestoneTitle(String milestoneTitle) {
+        this.milestoneTitle = milestoneTitle;
+    }
+}