add : WorkExperience에 ZERO 추가

src/main/java/umc/meme/shop/global/enums/WorkExperience.java

@@ -1,7 +1,7 @@
 package umc.meme.shop.global.enums;
 
 public enum WorkExperience {
-    ONE, TWO, THREE, FOUR,
+    ZERO, ONE, TWO, THREE, FOUR,
     FIVE, SIX, SEVEN, EIGHT,
     NINE, TEN
 }