Simple VM Manager

Write a simple VM manager that can list, add, modify, and delete virtual machines (VMs). Each VM contains a list of attributes. Errors should be handled, such as duplicate or non-existent IDs. Example test cases: Input: Add VM with ID 1, attributes {"name": "vm1", "cpu": "2 cores", "memory": "4 GB"} Output: Successfully added Input: Add VM with ID 1 Output: Error, ID already exists Input: Delete VM with ID 2 Output: Error, ID does not exist Data scale: Up to 10,000 VMs allowed at the same time No more than 10 attributes per VM Please ensure error handling for each command. Example Input add 1 {"name": "vm1", "cpu": "2 cores", "memory": "4 GB"}