#4 feat: binding result 관련 에러 사항 추가

src/main/java/com/example/board/exception/BindingException.java

@@ -0,0 +1,13 @@
+package com.example.board.exception;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class BindingException extends RuntimeException{
+    private String bindingMessages;
+
+    @Override
+    public String getMessage() {
+        return this.bindingMessages;
+    }
+}

src/main/java/com/example/board/response/Response.java

@@ -28,4 +28,7 @@ public static Response<String> fail(Exception e) {
         return new Response<>(e.getMessage(), 500, "fail");
     }
 
+    public static Response<String> fail(String bindingErrors) {
+        return new Response<>(bindingErrors, 400, "fail");
+    }
 }