Update README.md

Author: dvamsidhar2002

README.md

@@ -54,4 +54,13 @@ A[STATISTICAL HYPOTHESIS] --> F(NON-PARAMETRIC STATISTICAL TESTS);
   ```
 
   <li>NON-PARAMETRIC STATISTICAL HYPOTHESIS TESTS
+    
+    ```mermaid
+    flowchart TD
+    A[NON-PARAMETRIC STATISTICAL HYPOTHESIS TESTS] --> B(Mann-Whitney U test)
+    A[NON-PARAMETRIC STATISTICAL HYPOTHESIS TESTS] --> C(Wilcoxon Signed-Rank test)
+    A[NON-PARAMETRIC STATISTICAL HYPOTHESIS TESTS] --> D(Kruskal-Wallis H Test)
+    A[NON-PARAMETRIC STATISTICAL HYPOTHESIS TESTS] --> E(Friedman Test)
+    ```
+    
 </ol>