Add parking lot

website/docs/lld/parking-lot.md

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+# Designing Parking Lot
+
+In this artile we will design a parking lot and see its variations as asked in an interview.
+
+
+
+##### Functional Requirements 
+
+1. Customers can collect a parking ticket from the entry points and can pay the parking fee at the exit points on their way out.
+2. Customers can pay the tickets at the automated exit panel or to the parking attendant.
+
+3. Customers can pay via both cash and credit cards.
+4. Customer can pay online in the portal.
+5. System should support parking for different types of vehicles.
+6. Per hour parking fee model.
+
+##### Questions to be asked...
+
+1. Is the parking lot multi floored?  
+   YES
+2. What type of vehicles are we targeting at ? 
+   Car, truck, Electric vehicles(support for nearby charging), Scooters, van, Motorcycle
+3. Can we pre book our slot for parking ?
+   Lets keep that for phase 2 (Not now)
+
+
+##### Non Functional Requirements 
+1. System should not allow vehicles more than the maximum capacity.
+2. Multiple entry and exit points.
+3. Multiple parking spots i.e Compact, Large, Handicapped, Motorcycle, etc
+4. Each parking floor should have a display board showing any free parking spot for each spot type.
+
+**Note**: Now we have all the things that needs to be done. Lets understand who all are the users of our application.
+
+1. **Admin**: Responsible for adding/ removing/ updating parking floors, parking spots, entrance, and exit panels and parking attendants.
+2. **Customer**: Can get a parking ticket and pay for it
+3. **Parking Attendant**: Parking attendants can do all the activities on the customer’s behalf, and can take cash for ticket payment.
+4. **System**:  To display messages on different info panels, as well as assigning and removing a vehicle from a parking spot.
+
+#### Use Case Diagram
+
+![usecase](../../static/img/parking-lot/usecase.svg)
+