Triple Constructor - Employee

Create a class named Employee with three private members: String name, String role, double salary.

Requirements:
1. Create a constructor Employee(String name, String role, double salary) that sets all three fields.
2. Create a public toString() that returns: "name - role: salary".

IMPORTANT: Do NOT write a main method. A hidden Main will create new Employee("Ava", "Designer", 55000.5) and print the object.