add mermaid graph

README.md

@@ -19,7 +19,7 @@ Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.
   }
 }%%
 
-flowchart TB
+flowchart
 
 subgraph Legend
 l1(Sample)
@@ -136,6 +136,7 @@ d9(gr4a_lrg.jpg)
 end
 
 subgraph assays\QuantificationAndStatisticalAnalysis
+direction TB
 pr25>QuantificationAndStatisticalAnalysis.md]-->d10("`gr6c_lrg.jpg
         mmc3.xlsx`")
 end