Add Practical MongoDB Aggregations (ramnes#102)

README.md

@@ -69,6 +69,7 @@ Inspired by the [awesome](https://github.com/sindresorhus/awesome) list thing. F
  - [50 Tips and Tricks for MongoDB Developers](https://www.oreilly.com/library/view/50-tips-and/9781449306779/) - Advanced MongoDB tips and tricks, given by a MongoDB inc. engineer
  - [Builder Book](https://builderbook.org) - Learn how to build a full stack JavaScript web app from scratch
  - [MongoDB Applied Design Patterns (Rick Copeland)](https://www.oreilly.com/library/view/mongodb-applied-design/9781449340056/)
+ - [Practical MongoDB Aggregations](https://www.practical-mongodb-aggregations.com/) - How to develop effective and optimal data manipulation and analytics pipelines
  - [The Little MongoDB Book](https://www.openmymind.net/2011/3/28/The-Little-MongoDB-Book/) - Basic introduction
  - [SaaS Boilerplate Book](https://builderbook.org/book) - Learn how to build a production-ready SaaS web app from scratch