Create README.md for Day 01 Java programming

Added README.md for Day 01 of Java programming practice, outlining topics covered and objectives.

Author: curious-vasavi

src/Number_Programing/Core_Level/Day - 01/README.md

@@ -0,0 +1,34 @@
+# Core Level Number Programming – Day 01
+
+This folder contains core-level Java number programming problems practiced as part of daily coding preparation.
+This seem small and easy looking at but in every program we use them for logic building this simple logics help us in programming a lot . 
+All the programs are written in neat and clean methods . 
+
+## Topics Covered
+- Even or Odd Number
+- Count of Numbers in a Given Range
+- Count of Digits
+- Sum of Digits
+- Product of Digits
+- Reverse of a Number
+- Factorial of a Number
+- Fibonacci Series
+- Prime Number Check
+- Cube of a Number
+
+## Objective
+The goal of these programs is to strengthen understanding of:
+- Basic control flow (if-else, loops)
+- Mathematical logic
+- Input handling using `Scanner`
+- Writing clean and readable Java code
+
+Each problem is implemented as a **separate Java file** for clarity and easy practice.
+
+## Notes
+- These are core-level problems focused on fundamentals.
+- Code is written for learning and interview preparation.
+- Advanced optimizations are intentionally avoided at this stage.
+
+---
+Day 01 of Java Programming Practice