Add DataDriven.io to Education Companies

DataDriven.io is a data engineering interview prep platform with
interactive SQL, Python, and schema design practice against live
databases. It covers the full DE interview loop: SQL, Python for
data engineering, data modeling, and pipeline architecture.

Available on iOS and web at https://www.datadriven.io

Author: datadriven-io

README.md

@@ -83,6 +83,7 @@ Top must-join communities for ML:
   - [Dingo](https://github.com/MigoXLab/dingo)
 - Education Companies
   - [DataExpert.io](https://www.dataexpert.io)
+  - [DataDriven.io](https://www.datadriven.io)
   - [LearnDataEngineering.com](https://www.learndataengineering.com)
   - [AlgoExpert](https://www.algoexpert.io)
   - [ByteByteGo](https://www.bytebytego.com)