Add Qrlew as a user in README.md

[ngrislain]

Qrlew

The open-source DP layer for SQL

Qrlew (/ˈkɝlu/) is the open source library that rewrites SQL queries into privacy-preserving variants using Differential Privacy (DP).

Use Qrlew if you want to bring privacy guarantees to your SQL pipelines. It is:

• SQL-to-SQL: Qrlew turns SQL queries into differentially-private SQL queries that can be executed at scale on many SQL datastore, in many SQL dialects.
• Feature-rich: Qrlew covers the broadest range of SQL queries, including JOIN and nested queries
• Privacy-optimized: Qrlew keeps track of tight bounds and ranges throughout each step, minimizing the amount of noise needed to achieve differential privacy.

[alamb]

Thanks @ngrislain -- always great to have another user listed!