Add article on performance (ramnes#103)

README.md

@@ -64,6 +64,7 @@ Inspired by the [awesome](https://github.com/sindresorhus/awesome) list thing. F
  - [Optimizing MongoDB Compound Indexes (A. Jesse Jiryu Davis, MongoDB Inc.)](https://emptysqua.re/blog/optimizing-mongodb-compound-indexes/) - Everything you need/have to know about indexes
  - [Server Discovery And Monitoring In PyMongo, Perl, And C (A. Jesse Jiryu Davis, MongoDB Inc.) ](https://emptysqua.re/blog/server-discovery-and-monitoring-in-pymongo-perl-and-c/)
  - [Monitoring MongoDB performance metrics (Jean-Mathieu Saponaro, Datadog)](https://www.datadoghq.com/blog/monitoring-mongodb-performance-metrics-wiredtiger/)
+ - [Tuning MongoDB performance for production systems (Marek Trunkat, Apify)](https://blog.apify.com/tuning-mongodb-performance/) - The techniques and MongoDB Cloud features to debug performance issues and expose sub-optimal queries
 
 ### Books
  - [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