BtnGroup 생성

client/src/components/Buttons/BtnGroup.js

+import { useHistory } from "react-router-dom";
+
+const BtnGroup = () => {
+    const history = useHistory();
+
+    return (
+        <div className="d-flex justify-content-around my-4">
+            <button className="btn btn-white col-4 shadow-none border-dark" type="button" onClick={() => history.goBack()}>취소</button>
+            <button className="btn btn-crimson col-4" type="submit">확인</button>
+        </div>
+    )
+}
+
+export default BtnGroup
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