Added Omeka-s (#3194)

README.md

@@ -140,6 +140,7 @@ _Related: [Content Management Systems (CMS)](#content-management-systems-cms)_
 - [CKAN](https://ckan.org) - CKAN is a tool for making open data websites. ([Source Code](https://github.com/ckan/ckan)) `AGPL-3.0` `Python`
 - [Collective Access - Providence](https://collectiveaccess.org/) - Highly configurable Web-based framework for management, description, and discovery of digital and physical collections supporting a variety of metadata standards, data types, and media formats. ([Source Code](https://github.com/collectiveaccess/providence)) `GPL-3.0-only` `PHP`
 - [Horahora](https://github.com/horahoradev/horahora) - Video hosting website and video archival manager for Niconico, Bilibili, and Youtube. `MIT` `Go`
+- [Omeka S](https://omeka.org/s/) - Omeka S is a web publication system for universities, galleries, libraries, archives, and museums. It consists of a local network of independently curated exhibits sharing a collaboratively built pool of items, media, and their metadata. ([Source Code](https://github.com/omeka/omeka-s)) `GPL-3.0` `Nodejs`
 - [LiveStreamDVR](https://github.com/MrBrax/LiveStreamDVR) `⚠` - An automatic Twitch recorder capable of capturing live streams, chat messages and stream metadata. `MIT` `Python/Nodejs`