doc: Add section store/tagging

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+## Tagging entries {#sec:thestore:tagging}
+
+A store entry MAY be tagged. A tag is a String which matches the
+regular expression in @lst:tagging:regex
+
+```{#lst:tagging:regex .numberLines caption="Regular Expression for Tags"}
+/^[a-zA-Z]([a-zA-Z0-9_-]*)$/
+```
+
+Tags MUST BE stored in the header section "imag" in the key "tags" as an Array
+of Strings.
+The tags MUST BE sorted in alphabetical order.
+