add description for human resources management category

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

README.md

@@ -1110,6 +1110,9 @@ Collaborative software or [groupware](https://en.wikipedia.org/wiki/Collaborativ
 
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+A [human resources management system](https://en.wikipedia.org/wiki/Human_resource_management_system) combines a number of systems and processes to ensure the easy management of [human resources](https://en.wikipedia.org/wiki/Human_resources), business processes and data.
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 - [admidio](https://www.admidio.org/) - Admidio is a free open source user management system for websites of organizations and groups. The system has a flexible role model so that it’s possible to reflect the structure and permissions of your organization. ([Demo](https://www.admidio.org/demo/), [Source Code](https://github.com/Admidio/admidio)) `GPL-2.0` `PHP`
 - [IceHrm](https://icehrm.com/) - IceHrm employee management system allows companies to centralize confidential employee information. ([Demo](https://icehrm.com/demo.php), [Source Code](https://github.com/gamonoid/icehrm)) `Apache-2.0` `PHP`
 - [OrangeHRM](https://www.orangehrm.com/) - OrangeHRM is a comprehensive HRM system that captures all the essential functionalities required for any enterprise. ([Source Code](https://sourceforge.net/projects/orangehrm/)) `GPL-2.0` `PHP`