update README

Author: minhduc29

README.md

@@ -1 +1,23 @@
-# leetcode-contest-analytics
+# LeetCode Contest Analytics
+
+## Overview
+- A data engineering project to extract, transform, and load LeetCode contest ranking data and contest problems data.
+- This project was created to analyze data from past LeetCode contests and top contestants, aiming to set the basis 
+for efficient contest practice and further data analytics from each user profile.
+- Data were collected from the top **50,000** users of LeetCode global contest ranking and **2334** problems of 
+**585** contests.
+- Some analytics with visualizations are provided in `analytics/analytics.md`.
+- The collected data are stored in the `data/` folder.
+
+## Technology Stack
+- Orchestration: **Apache Airflow**
+- Storage: **Amazon S3**
+- ETL jobs: **Pandas**, **AWS Glue**
+- Data warehouse & Analytics: **Amazon Redshift**
+- For additional libraries, please consult `requirements.txt`.
+
+## Potential Ideas
+- Machine Learning/Deep Learning models.
+- User profile analysis and ranking prediction.
+- Further analytics and statistics from other LeetCode data.
+- Data pipelines and analytics for other platforms.