Add README.md with Core Java programs details

Author: PrityKumari14

README.md

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+# Core Java Programs
+
+## Description
+This repository contains multiple Core Java programs for practice and learning.  
+It includes programs on arrays, patterns, recursion, functions, operators, keywords, loops, control statements, strings, StringBuilder, sorting algorithms, bit manipulation, mathematical operations, odd/even checks, prime number checks, multiplication tables, and more.
+
+## Technologies
+- Java SE
+- Core Java concepts (OOP, loops, arrays, recursion, functions, operators, strings)
+- Optional: Any IDE like VS Code or IntelliJ IDEA
+
+## Programs List (Topics Covered)
+1. **Arrays** – Basic operations, traversals, and manipulations  
+2. **Patterns** – Star, number, and character patterns  
+3. **Recursion** – Factorial, Fibonacci, and other recursive problems  
+4. **Functions / Methods** – Custom functions and method calls  
+5. **Operators & Keywords** – Arithmetic, logical, and relational operations  
+6. **Loops & Control Statements** – for, while, do-while, if-else, switch-case  
+7. **Strings & StringBuilder** – String manipulations, concatenation, reverse  
+8. **Sorting Algorithms** – Bubble sort, selection sort, insertion sort  
+9. **Bit Manipulation** – Bitwise operations, shifts, AND, OR, XOR  
+10. **Mathematical Operations** – Odd/even checks, prime numbers, multiplication tables  
+11. **Other small programs** – Miscellaneous coding exercises  
+
+## How to Run
+1. Clone the repository:
+```bash
+git clone https://github.com/username/Core-Java-Programs.git