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.application/Tasks/ITaskService.cs

@@ -0,0 +1,15 @@
+using Mws.Application.Common;
+using TaskPriority = Mws.Domain.Tasks.TaskPriority;
+using TaskStatus = Mws.Domain.Tasks.TaskStatus;
+
+namespace Mws.Application.Tasks;
+
+public interface ITaskService
+{
+    Task<List<TaskDto>> GetTasksAsync(Guid userId, Guid projectId, TaskStatus? status, TaskPriority? priority, Guid? assigneeId, CancellationToken ct = default);
+    Task<TaskDto> GetAsync(Guid userId, Guid taskId, CancellationToken ct = default);
+    Task<TaskDto> CreateAsync(Guid userId, Guid projectId, CreateTaskRequest request, CancellationToken ct = default);
+    Task<TaskDto> UpdateAsync(Guid userId, Guid taskId, UpdateTaskRequest request, CancellationToken ct = default);
+    Task DeleteAsync(Guid userId, Guid taskId, CancellationToken ct = default);
+    Task<List<TaskDto>> SearchAsync(Guid userId, string term, CancellationToken ct = default);
+}