연락처 placeholder 추가

src/components/cstmrService/inquiry/InquiryWrite.js

@@ -85,6 +85,7 @@ function InquiryWrite({
                   onChange={e =>
                     handlerChangeInquiryForm('contact', e.target.value)
                   }
+                  placeholder='- 제외 숫자만 입력'
                 />
                 <div className='feedback'>
                   <p>