Made the class diagram

ClassDiagram.puml

@@ -0,0 +1,49 @@
+@startuml
+abstract class Employee {
+    -string name
+    -Gender gender
+    -string department
+    +string Name [readonly]
+    +Gender Gender [readonly]
+    +string Department [readonly]
+    +{abstract} decimal Salary [readonly]
+    +Employee(string, Gender, string)
+    +override string ToString()
+}
+
+enum Gender {
+    Male
+    Female
+    Divers
+}
+
+class Worker {
+    -decimal hoursWorked
+    -decimal wagePerHour
+    +decimal HoursWorked [readonly]
+    +decimal WagePerHour [readonly]
+    +override decimal Salary [readonly]
+    +Worker(string, Gender, string, decimal, decimal)
+    +Worker(string, string, decimal, decimal)
+    +override string ToString()
+}
+
+class OfficeEmployee {
+    -decimal monthlySalary
+    +decimal MonthlySalary [readonly]
+    +override decimal Salary [readonly]
+    +OfficeEmployee(string, Gender, string, decimal)
+    +override string ToString()
+}
+
+class Manager {
+    +override decimal Salary [readonly]
+    +Manager(string, string, decimal)
+    +override string ToString()
+}
+
+Employee <|-- Worker
+Employee <|-- OfficeEmployee
+OfficeEmployee <|-- Manager
+Employee -- Gender
+@enduml