Commit MWS backend source tree

The ASP.NET Core solution (mws.api/mws.application/mws.domain/
mws.infrastructure) existed only as untracked working files. Adding
it to version control, plus a .gitignore for build output and local
tooling directories, so the CQRS/mediator refactor plan has a real
git history to branch and diff against.

mws.domain/Tasks/TaskItem.cs

@@ -0,0 +1,33 @@
+namespace Mws.Domain.Tasks;
+
+public enum TaskStatus
+{
+    Todo = 1,
+    InProgress = 2,
+    Done = 3,
+    Cancelled = 4,
+}
+
+public enum TaskPriority
+{
+    Low = 1,
+    Medium = 2,
+    High = 3,
+}
+
+public class TaskItem
+{
+    public Guid Id { get; set; }
+    public Guid ProjectId { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public TaskStatus Status { get; set; } = TaskStatus.Todo;
+    public TaskPriority Priority { get; set; } = TaskPriority.Medium;
+    public Guid? AssigneeId { get; set; }
+    public DateTime? DueDate { get; set; }
+    public Guid CreatedBy { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+
+    public Mws.Domain.Users.User? Assignee { get; set; }
+}