List tasks feature (#4)

This PR contains the work done to implement the **List Tasks** feature, and to integrate it into the main content view of the app.

Reviewed-on: rock-n-code/todos-app#4
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

UnitTests/Tests/View Models/TaskListViewModelTests.swift

@@ -0,0 +1,27 @@
+import Foundation
+import SwiftData
+import Testing
+
+@testable import Todos
+
+@Suite("TaskList view model tests")
+struct TaskListViewModelTests {
+
+    // MARK: Computed tests
+
+    @Test(
+        "navigationTitle returns correct title for each and every group",
+        arguments: TodoGroup.allCases
+    )
+    func navigationTitle(for group: TodoGroup) {
+        // GIVEN
+        let viewModel = TaskListView.ViewModel(group: group)
+
+        // WHEN
+        let title = viewModel.navigationTitle
+
+        // THEN
+        #expect(title == group.title)
+    }
+
+}