[feat] 배너 에러코드 추가

src/main/java/team7/inplace/global/exception/code/BannerErrorCode.java

@@ -0,0 +1,32 @@
+package team7.inplace.global.exception.code;
+
+import org.springframework.http.HttpStatus;
+
+public enum BannerErrorCode implements ErrorCode {
+    NOT_FOUND("B001", "배너를 찾을 수 없습니다.", HttpStatus.NOT_FOUND);
+
+    private final String code;
+    private final String message;
+    private final HttpStatus httpStatus;
+
+    BannerErrorCode(String code, String message, HttpStatus httpStatus) {
+        this.code = code;
+        this.message = message;
+        this.httpStatus = httpStatus;
+    }
+
+    @Override
+    public HttpStatus httpStatus() {
+        return httpStatus;
+    }
+
+    @Override
+    public String code() {
+        return code;
+    }
+
+    @Override
+    public String message() {
+        return message;
+    }
+}