Add tag plugin

config/plugins

@@ -18,3 +18,4 @@ color                        https://github.com/hanche/dokuwiki_color_plugin
 graphviz                     https://github.com/psy/dokuwiki-plugin-graphviz
 drawio                       https://github.com/lejmr/dokuwiki-plugin-drawio
 edittable                    https://github.com/cosmocode/edittable
+tag                          https://github.com/dokufreaks/plugin-tag