Add sge-backend foldery

sge-backend/src/main/java/com/sgs/exception/CustomException.java

@@ -0,0 +1,26 @@
+package com.sgs.exception;
+
+import org.springframework.http.HttpStatus;
+
+public class CustomException extends RuntimeException {
+
+    private static final long serialVersionUID = 1L;
+
+    private final String message;
+    private final HttpStatus httpStatus;
+
+    public CustomException(String message, HttpStatus httpStatus) {
+        this.message = message;
+        this.httpStatus = httpStatus;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+
+    public HttpStatus getHttpStatus() {
+        return httpStatus;
+    }
+
+}