Update header for Medium Level Number Programming

Author: curious-vasavi

README.md

@@ -11,7 +11,7 @@ through day-wise problem solving.
 - **Day 01: Core Number Programs**  
   👉 [View Day 01 Programs](src/number_Programming/core/day_01)
 
-📁 Medium Level – Number Programming
+## 📁 Medium Level – Number Programming
 
 - **Day 02: Medium Number Programs**  
   👉 [View Day 02 Programs](src/number_Programming/medium/day_02)