Add kirby-markup plugin

Author: texnixe

content/plugins/scottboms/kirby-markup/card.png

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+Title: Semantic Markup Tags
+
+----
+
+Text:
+
+----
+
+Repository: https://github.com/scottboms/kirby-markup
+
+----
+
+Category: text
+
+----
+
+Description: A collection of Kirbytags and shortcut buttons to employ advanced semantic markup in textarea fields.
+
+----
+
+Example:
+
+```kirbytext
+(abbr: NASA title: National Aeronautics and Space Administration)
+```
+
+----
+
+Versions: 3,4