public async Task <IActionResult> Post(ToolDto tool)
        {
            var toolToAdd = _mapper.Map <Tool>(tool);

            toolToAdd.Added = DateTime.Now;

            if (tool.CurrentState != null)
            {
                toolToAdd.StateHistory = new ToolState[] { _mapper.Map <ToolState>(tool.CurrentState) };
            }
            else
            {
                toolToAdd.StateHistory = new ToolState[] {
                    new ToolState()
                    {
                        State = "new", Note = "Added to the toolkit", Tool = toolToAdd, WhenChanged = DateTime.Now
                    }
                };
            }


            var newTool = await _repo.AddTool(toolToAdd);

            var toolToReturn = _mapper.Map <ToolDto>(toolToAdd);

            return(Ok(toolToReturn));
        }