add description for genealogy category

- https://github.com/awesome-selfhosted/awesome-selfhosted/issues/2984

README.md

@@ -1075,6 +1075,8 @@ Utilities for managing game servers.
 
 **[`^        back to top        ^`](#)**
 
+[Genealogy software](https://en.wikipedia.org/wiki/Genealogy_software) used to record, organize, and publish genealogical data.
+
 - [Genea.app](https://genea.app/) - Genea is a privacy by design and open source tool anyone can use to author or edit their family tree. Data is stored in the GEDCOM format and all processing is done in the browser. ([Source Code](https://github.com/genea-app/genea-app)) `MIT` `Javascript`
 - [GeneWeb](https://geneweb.tuxfamily.org/wiki/GeneWeb) - GeneWeb is an open source genealogy software written in OCaml. It comes with a Web interface and can be used off-line or as a Web service. ([Demo](https://demo.geneweb.tuxfamily.org/gw7/), [Source Code](https://github.com/geneweb/geneweb)) `GPL-2.0` `OCaml`
 - [webtrees](https://www.webtrees.net) - Webtrees is the web's leading on-line collaborative genealogy application. ([Demo](https://dev.webtrees.net/demo-stable/index.php?ctype=gedcom&ged=demo), [Source Code](https://github.com/fisharebest/webtrees)) `GPL-3.0` `PHP`