Add root README with navigation links

This README provides an overview of the Java programming practice repository, including its structure and goals.

Author: curious-vasavi

README.md

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+README.md
+# Java Programming Practice
+
+A structured Java practice repository focused on building strong programming fundamentals
+through day-wise problem solving.
+
+---
+
+## 📁 Core Level – Number Programming
+
+- **Day 01: Core Number Programs**  
+  👉 [View Day 01 Programs](src/number_Programming/core/day_01)
+
+---
+
+## Repository Structure
+
+
+Each day contains:
+- Separate Java files for each problem
+- A README explaining the problem set and objectives
+
+---
+
+## Goal
+
+- Strengthen logical thinking
+- Improve control flow understanding
+- Build clean and reusable Java code
+- Prepare for interviews and advanced Java topics