Update README.md

Author: develper21

README.md

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-# Leetcode_Problem_Solution
-DSA & LeetCode solutions with clear explanations: well-documented code, complexity analysis, and step-by-step YouTube video walkthroughs. Ideal for students preparing coding interviews and mastering algorithms.
+````markdown
+# DSA with LeetCode — Explanations & Code (Video + Repo)
+
+**Welcome!** This repository contains clear, well-documented solutions to LeetCode problems, accompanied by step-by-step YouTube video explanations aimed at students learning Data Structures & Algorithms (DSA).
+
+> Learn algorithms the practical way: visual explanations, optimized code, and practice problems.
+
+---
+## 🧠 Coding style & conventions
+
+* Use meaningful variable names.
+* Include complexity analysis:
+
+  * Time: O(...)
+  * Space: O(...)
+* Add comments for non-trivial steps.
+* Keep solutions idiomatic for each language.
+---
+
+## 🤝 How to contribute
+
+1. Fork the repo.
+2. Create a branch: `feature/<problem-number>-<short-name>`
+3. Add problem folder using `LEETCODE_SOLUTION_TEMPLATE.md`.
+4. Create a PR with description and link to the LeetCode problem.
+5. Follow the PR checklist in `CONTRIBUTING.md`.
+
+See `CONTRIBUTING.md` for details and the PR template.
+
+---
+
+## 🎥 Video & repository links
+
+Each problem folder includes `video.md` with:
+
+* YouTube video link
+* Timestamps (approach, walkthrough, code explanation)
+* Full code link in repo
+---
+
+## ❤️ Support & Contact
+If this repo helped you, star ⭐ the repo and subscribe to the channel. Issues and PRs are welcome!
+---