Merge pull request dastergon#92 from thylong/capacity-planning/new-ar…

…ticle

Adding a new article in Capacity Planning

README.md

@@ -381,6 +381,8 @@ Contributions are always welcome!
 * [SouthBay SRE: Cloud Capacity Planning](https://www.youtube.com/watch?v=MDQ0uEUmLOo)
 * [Intent-based Capacity Planning and Autoscaling with Kubernetes](https://blog.squadcast.com/intent-based-capacity-planning-autoscaling-kubernetes/)
 * [How do you do Capacity Planning](https://jvns.ca/blog/2016/03/20/how-do-you-do-capacity-planning/)
+* [How Back Market SREs prepared for Black Friday](https://medium.com/back-market-engineering/how-back-market-sres-prepared-for-black-friday-5f017f343408)
+
 
 ## Service Level Agreement
 * [SLA Aware Maintenance for Operators - Joe Smith](https://www.youtube.com/watch?v=tZ0-SISvCis)