add doc/haredoc.txt help file and tags

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+*haredoc.txt* *haredoc*                                           haredoc in vim
+
+This plugin integrates the haredoc command of the Hare programming language,
+which looks up and displays documentation for the Hare standard library and
+your own Hare modules. See haredoc(1).
+
+        https://docs.harelang.org/
+
+This plugin appropriately uses |popup-window| and |terminal-window| to display
+documentation. If either |+popupwin| or |+terminal| is not available, this
+plugin falls back to a normal window.
+
+
+MAPPINGS
+
+                                                        *K* *haredoc-K*
+K                       Show documentation in a |popup-window| for the
+                        symbol under the cursor
+
+
+COMMANDS
+
+                                                        *:Haredoc*
+
+:Haredoc {symbol}       Show documentation in a |terminal-window| for the
+                        symbol under the cursor.
+
+:Haredoc .              Same as the |K| command.
+
+
+ vim:tw=78:ts=8:noet:ft=help:norl: