feat: PageResponse 구현 (#26)

* feat: `PageResponse` 구현

* refactor: 각 필드에 `final` 추가

src/main/java/com/odiga/fiesta/common/ApiResponse.java

@@ -11,10 +11,10 @@
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class ApiResponse<T> {
 
-	private int statusCode;
-	private HttpStatus status; // reason phrase
-	private String message;
-	private T data;
+	private final int statusCode;
+	private final HttpStatus status; // reason phrase
+	private final String message;
+	private final T data;
 
 	@Builder
 	private ApiResponse(HttpStatus status, String message, T data) {

src/main/java/com/odiga/fiesta/common/PageResponse.java

@@ -0,0 +1,37 @@
+package com.odiga.fiesta.common;
+
+import java.util.List;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+public class PageResponse<T> {
+
+	private final List<T> content;
+	private final int offset;
+	private final int pageSize;
+	private final int totalElements;
+	private final int totalPages;
+
+	@Builder
+	public PageResponse(List<T> content, int offset, int pageSize, int totalElements, int totalPages) {
+		this.content = content;
+		this.offset = offset;
+		this.pageSize = pageSize;
+		this.totalElements = totalElements;
+		this.totalPages = totalPages;
+	}
+
+	public static <T> PageResponse<T> of(List<T> content, int offset, int pageSize, int totalElements, int totalPages) {
+		return PageResponse.<T>builder()
+			.content(content)
+			.offset(offset)
+			.pageSize(pageSize)
+			.totalElements(totalElements)
+			.totalPages(totalPages)
+			.build();
+	}
+
+}
+