Add detailed README for 100 Days of Code challenge

README.md

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+# 🚀 100 Days of Code – CodeWithHarry Challenge
+
+Welcome to my **100 Days of Code** journey inspired by [CodeWithHarry](https://www.youtube.com/@CodeWithHarry).  
+The goal is simple: **Code every day for 100 days** and document my progress.
+
+---
+
+## 📅 Challenge Rules
+1. Code for at least **1 hour every day** for the next 100 days.
+2. Work on **real projects** and **solve problems** — not just watch tutorials.
+3. Commit code **daily** to this repository.
+4. Document daily progress in the `log.md` file.
+5. Share updates online to stay accountable.
+
+---
+
+## 🗓 Start Date
+**DD Month YYYY**  
+(Replace with your actual start date)
+
+---
+
+## 🎯 Goals
+- Master **C++** (OOP, DSA, Projects)
+- Explore **Python** for scripting and automation
+- Learn **web development basics**
+- Build **at least 3 real-world projects**
+- Improve problem-solving skills with **LeetCode / HackerRank**
+
+---