Update adopters.md

docs/en/introduction/adopters.md

@@ -88,6 +88,7 @@ toc_title: Adopters
 | <a href="https://smi2.ru/" class="favicon">SMI2</a>                                            | News                            | Analytics             | —                                                          | —                                                                            | [Blog Post in Russian, November 2017](https://habr.com/ru/company/smi2/blog/314558/)                                                                                                                                    |
 | <a href="https://www.splunk.com/" class="favicon">Splunk</a>                                   | Business Analytics              | Main product          | —                                                          | —                                                                            | [Slides in English, January 2018](https://github.com/ClickHouse/clickhouse-presentations/blob/master/meetup12/splunk.pdf)                                                                                               |
 | <a href="https://www.spotify.com" class="favicon">Spotify</a>                                  | Music                           | Experimentation       | —                                                          | —                                                                            | [Slides, July 2018](https://www.slideshare.net/glebus/using-clickhouse-for-experimentation-104247173)                                                                                                                   |
+| <a href="https://www.staffcop.ru/" class="favicon">Staffcop</a>                                | Information Security                      | Main Product | —                                                          | —                                                                            | [Official website, Documentation](https://www.staffcop.ru/sce43) |
 | <a href="https://www.tencent.com" class="favicon">Tencent</a>                                  | Big Data                        | Data processing       | —                                                          | —                                                                            | [Slides in Chinese, October 2018](https://github.com/ClickHouse/clickhouse-presentations/blob/master/meetup19/5.%20ClickHouse大数据集群应用_李俊飞腾讯网媒事业部.pdf)                                                   |
 | <a href="https://www.tencent.com" class="favicon">Tencent</a>                                  | Messaging                       | Logging               | —                                                          | —                                                                            | [Talk in Chinese, November 2019](https://youtu.be/T-iVQRuw-QY?t=5050)                                                                                                                                                   |
 | <a href="https://trafficstars.com/" class="favicon">Traffic Stars</a>                          | AD network                      | —                     | —                                                          | —                                                                            | [Slides in Russian, May 2018](https://github.com/ClickHouse/clickhouse-presentations/blob/master/meetup15/lightning/ninja.pdf)                                                                                          |