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/Common/Repositories/IRoleRepository.cs

@@ -0,0 +1,14 @@
+using Mws.Domain.Roles;
+
+namespace Mws.Application.Common.Repositories;
+
+public interface IRoleRepository : IRepository<Role>
+{
+    Task<List<Role>> GetAllWithPermissionsAsync(CancellationToken ct = default);
+    Task<Role?> GetByIdWithPermissionsAsync(Guid id, CancellationToken ct = default);
+    Task<Role?> GetByIdAsync(Guid id, CancellationToken ct = default);
+    Task<bool> ExistsByNameAsync(string name, Guid? excludeId, CancellationToken ct = default);
+    Task<RolePermission?> GetPermissionAsync(Guid roleId, string screen, CancellationToken ct = default);
+    Task<Dictionary<string, RolePermission>> GetPermissionsAsync(Guid roleId, CancellationToken ct = default);
+    void RemovePermissions(IEnumerable<RolePermission> permissions);
+}