docs: diagram domain model

Author: Xiphereal

Docs/DomainModel.puml

@@ -0,0 +1,22 @@
+@startuml
+skin rose
+
+'https://plantuml.com/class-diagram
+
+class Task {
+    + Name : string
+    + Description : string
+    + StartWorkOn : DateTime
+    + DeliveredOn : DateTime
+}
+
+Project -> "0..*" Task : {ordered}
+Task "parent 0..1" -> "child 0..*" Task
+
+Project -> "0..*" TaskProposal
+TaskProposal -> "0..*" Task : becomes 
+
+package FlowMetrics {}
+Project --> FlowMetrics
+
+@enduml

README.md

@@ -1,5 +1,9 @@
 A simple task manager focused on minimal management and some flow metrics.
 
+Domain model:
+
+![Domain model diagram of a task management application.](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/Xiphereal/SGjsdfgklj/refs/heads/trunk/Docs/DomainModel.puml)
+
 Use cases:
 
 ![Uses cases of a task management application](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/Xiphereal/SGjsdfgklj/refs/heads/trunk/Docs/UseCases.puml)