Update README.md

Author: zelhajou

module 09/ex00/README.md

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-### **Leap Year** 🗓️  
 
-A **leap year** is a year with **366 days** (instead of 365) to keep our calendar aligned with Earth’s orbit around the Sun. An extra day is added to **February (29 days)**.  
-
-#### **Leap Year Rules:**  
-A year is a leap year if:  
-1️⃣ **Divisible by 4** → ✅ Possible leap year.  
-2️⃣ **Divisible by 100** → ❌ Not a leap year (exception below).  
-3️⃣ **Divisible by 400** → ✅ Leap year.  
-
-#### **Why These Rules?**  
-- Earth takes **365.2425 days** to orbit the Sun.  
-- Adding **1 day every 4 years** corrects the 0.2425-day drift.  
-- Skipping leap years every **100 years** prevents overcorrection.  
-- Keeping leap years every **400 years** prevents undercorrection.  
-
-#### **Examples:**  
-✅ **Leap Years** → 1600, 2000, 2024  
-❌ **Not Leap Years** → 1700, 1800, 1900, 2100  
-
-This system keeps our calendar **accurate and synchronized** with the seasons! 🌍✨