added header ziplist.h

ziplist.h

 #define ZIPLIST_HEAD 0
 #define ZIPLIST_TAIL 1
+
+unsigned char *ziplistNew(void);
+unsigned char *ziplistPush(unsigned char *zl, unsigned char *entry, unsigned int elen, int where);
+unsigned char *ziplistPop(unsigned char *zl, sds *target, int where);
+unsigned char *ziplistIndex(unsigned char *zl, unsigned int index);
+unsigned char *ziplistNext(unsigned char *p);
+unsigned int ziplistGet(unsigned char *p, unsigned char **e, unsigned int *elen, long long *v);
+unsigned char *ziplistDelete(unsigned char *zl, unsigned char **p);
+unsigned char *ziplistDeleteRange(unsigned char *zl, unsigned int index, unsigned int num);
+unsigned int ziplistCompare(unsigned char *p, unsigned char *entry, unsigned int elen);
\ No newline at end of file