add digital-signage tag and three softwares

software/anthias.yml

@@ -0,0 +1,11 @@
+name: Anthias
+website_url: https://anthias.screenly.io/
+source_code_url: https://github.com/Screenly/Anthias
+description: Digital signage platform for Raspberry Pi and x86 devices with web-based content management.
+licenses:
+  - GPL-2.0
+platforms:
+  - Python
+  - Docker
+tags:
+  - Digital Signage

software/garlic-hub.yml

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+name: Garlic-Hub
+website_url: https://garlic-signage.com/garlic-hub/
+source_code_url: https://github.com/garlic-signage/garlic-hub
+description: Digital signage device and content management system with SMIL playlist support and scheduling.
+licenses:
+  - AGPL-3.0
+platforms:
+  - PHP
+  - Javascript
+  - Docker
+tags:
+  - Digital Signage

software/xibo.yml

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+name: Xibo
+website_url: https://xibosignage.com/
+source_code_url: https://github.com/xibosignage/xibo-cms
+description: Digital signage content management system with scheduling, display management and multi-user support.
+licenses:
+  - AGPL-3.0
+platforms:
+  - PHP
+  - Docker
+tags:
+  - Digital Signage

tags/digital-signage.yml

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+name: Digital Signage
+description: '[Digital Signage](https://en.wikipedia.org/wiki/Digital_signage) software for managing and displaying content on remote screens.'