Add add_header_left html
diff --git a/R/util.R b/R/util.R
index 3f5c470..a500879 100644
--- a/R/util.R
+++ b/R/util.R
@@ -67,3 +67,5 @@
   mapping_matrix <- data.frame(mapping_matrix)
   return(mapping_matrix)
 }
+
+