Add funcs ReadDir, Exists.

writer/pkg/storage/file_manager.go

@@ -33,3 +33,13 @@ func ReadDir(dirData string) ([]os.DirEntry, error) {
 
 	return files, nil
 }
+
+// Exists check if the file or directory exists.
+func Exists(path string) bool {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true
+	}
+
+	return false
+}