Added lots of commands

Simplified KeePass client

ModernKeePass.Application/Group/Commands/AddGroup/AddGroupCommand.cs

@@ -0,0 +1,36 @@
+using System.Threading.Tasks;
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+using ModernKeePass.Application.Database.Queries.IsDatabaseOpen;
+using ModernKeePass.Application.Group.Models;
+using ModernKeePass.Domain.Exceptions;
+
+namespace ModernKeePass.Application.Group.Commands.AddGroup
+{
+    public class AddGroupCommand : IRequest
+    {
+        public GroupVm ParentGroup { get; set; }
+        public GroupVm Group { get; set; }
+
+        public class AddGroupCommandHandler : IAsyncRequestHandler<AddGroupCommand>
+        {
+            private readonly IDatabaseProxy _database;
+            private readonly IMediator _mediator;
+
+            public AddGroupCommandHandler(IDatabaseProxy database, IMediator mediator)
+            {
+                _database = database;
+                _mediator = mediator;
+            }
+
+            public async Task Handle(AddGroupCommand message)
+            {
+                var isDatabaseOpen = await _mediator.Send(new IsDatabaseOpenQuery());
+                if (!isDatabaseOpen) throw new DatabaseClosedException();
+
+                await _database.AddGroup(message.ParentGroup.Id, message.Group.Id);
+                message.ParentGroup.SubGroups.Add(message.Group);
+            }
+        }
+    }
+}