public async Task CreateKeywordAsync(KeywordDTO keywordDTO)
        {
            var keyword   = _mapper.Map <Keyword>(keywordDTO);
            var resources = _mapper.Map <List <Resource> >(keywordDTO.Resources);

            keyword.KeywordResources = new List <KeywordResource>();
            foreach (Resource resource in resources)
            {
                var existedResourse = await _resourceRepository.UrlExists(resource.UrlAddress);

                if (existedResourse != default)
                {
                    _keywordRepository.AddResourceToKeyword(new KeywordResource {
                        Resource = existedResourse, Keyword = keyword
                    });
                }
                else
                {
                    _keywordRepository.AddResourceToKeyword(new KeywordResource {
                        Resource = resource, Keyword = keyword
                    });
                }
            }
            _keywordRepository.Add(keyword);
            await _context.SaveChangesAsync();
        }