Adding color version 2022-10-19 (e28b337).

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/55/color/README.md

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+# color Plugin
+
+This is a plugin for [dokuwiki](https://www.dokuwiki.org/start)..
+
+See the plugin  [homepage](https://www.dokuwiki.org/plugin:color) for detailed documentation. Here we provide a brief summary of the required syntax:
+
+```
+<color ⟨fg color⟩[/⟨bg color⟩[/⟨ignored text⟩]]>⟨text⟩</color>
+<color ⟨fg color⟩:⟨bg color⟩[:⟨ignored text⟩]>⟨text⟩</color>
+```
+
+- Square brackets indicates optional parts.
+
+- `⟨fg color⟩` and `⟨bg color⟩` are CSS color specifications. Either one may be empty, in which case it is ignored.
+
+- In the first syntax, the color specification(s) MUST NOT include a slash (`/`).
+- In the second syntax, the color specification(s) MUST NOT include a colon character (`:`). We do not know any legal CSS color specification that does include a colon, nor do we anticipate that one will appear in the future.
+- The resulting HTML is a `<span>` element containing `⟨text⟩`, colorized with the given foreground and background colors.