update

Writerside/topics/OOAD/DesigningForMaintainability.md

@@ -2,50 +2,8 @@
 
 ## [UML (Unified Modeling Language)](UML.md)
 
-```mermaid
-classDiagram
-    class AdventurePackage {
-        -title: String
-        -description: String
-    }
+## [Agile Design](AgileDesign.md)
 
-    class Trip {
-        -startingDate: Date
-    }
+## [Design Principles](DesignPrinciples.md)
 
-    class Accommodation {
-        -name: String
-        -address: String
-    }
-
-    class Person {
-        -name: String
-        -address: String
-    }
-
-    class Participant {
-    }
-
-    class TourGuide {
-    }
-
-    class Booking {
-        -bookingDate: Date
-        -isPaid: Boolean
-    }
-
-    Person <|-- Participant
-    Person <|-- TourGuide
-
-    AdventurePackage "1" --o "0..*" Trip : contains >
-    Trip "0..*" -- "1" Accommodation : has >
-    Trip "0..*" -- "1" TourGuide : leads >
-    Trip "0..*" -- "0..*" Participant : booked by >
-
-    Participant "1" --o "0..*" Booking : makes >
-    Booking "0..*" -- "1" Trip : for >
-    Booking "0..*" -- "1" Participant : by >
-
-    TourGuide "1" --o "0..*" AdventurePackage : certified for >
-
-```
+## [Design Patterns](DesignPatterns.md)