update oop.md

Design a parking lot system is an important sample question in low-level design. It would be great if this question is added.
4 years ago · 2f094792f8
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@ -11,6 +11,7 @@ title: Object-Oriented Programming
 - Discuss algorithms and data structures for a garbage collector?
 - How would you implement an HR system to keep track of employee salaries and benefits?
 - How would you implement an Elevator system?
+- How would you implement a Parking Lot system?

 ## Courses