contents(sd): add system design in a hurry (#641)

Co-authored-by: Yangshun Tay <tay.yang.shun@gmail.com>

apps/website/contents/system-design.md

@@ -48,6 +48,7 @@ System design content is still work-in-progress, but the following are some reso
 ## Quality resources
 
 - ["Front End System Design Guidebook" by GreatFrontEnd](https://www.greatfrontend.com/system-design) - A free system design guidebook by yours truly, focused on system design for the front end, e.g. how to design Facebook's News Feed, Autocomplete components, Image Carousels and more.
+- [System Design in a Hurry](https://www.hellointerview.com/learn/system-design) - Free course built by ex- Meta and Amazon engineers, covers the basics of delivery, high-level concepts, and core technologies. Worked "common problems" walk you through various design decisions in real problems and how to navigate them.
 - [System Design Newsletter](https://newsletter.systemdesign.one/) - Weekly newsletter on system design. Also get the powerful system design template for FREE.
 - [ByteByteGo](https://bytebytego.com?fpr=techinterviewhandbook) - This is a new System Design course by Alex Xu, author of the System Design Interview books, a bestseller on Amazon. The course covers system designs basics, then goes into deep dives of the design of over 10 famous common products (e.g. [Designing YouTube](https://bytebytego.com/courses/system-design-interview/design-youtube?fpr=techinterviewhandbook), Facebook Newsfeed, etc) and multiple big data and storage systems (e.g. [Designing a Chat System](https://bytebytego.com/courses/system-design-interview/design-a-chat-system?fpr=techinterviewhandbook)). For each deep dive, concepts are explained and comprehensive diagrams are used, making it very approachable regardless of seniority level.
 - ["Grokking the System Design Interview" by Design Gurus](https://designgurus.org/link/kJSIoU?url=https%3A%2F%2Fdesigngurus.org%2Fcourse%3Fcourseid%3Dgrokking-the-system-design-interview) - This is probably the most famous system design interview course on the internet and what makes it different from most other courses out there is that it is purely text-based, which is great for people who prefer reading over watching videos (such as myself!). It contains a repository of the popular system design problems along with a glossary of system design basics. I've personally completed this course and highly recommended many others to use this.