Add history documentation

modules/history/README.md

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+History
+=======
+
+Sets [history][1] options.
+
+Options
+-------
+
+ - `HISTFILE`, The file to save the history in when an interactive shell exits.
+ - `HISTSIZE`, The maximum size of the history list.
+ - `SAVEHIST`, The maximum number of history events to save in the history file.
+ - `BANG_HIST`, Treat the `!` character specially during expansion.
+ - `EXTENDED_HISTORY`, Write the history file in the `:start:elapsed;command`
+format.
+ - `INC_APPEND_HISTORY`, Write to the history file immediately, not when the
+shell exits.
+ - `SHARE_HISTORY`, Share history between all sessions.
+ - `HIST_EXPIRE_DUPS_FIRST`, Expire duplicate entries first when trimming
+history.
+ - `HIST_IGNORE_DUPS`, Don't record an entry that was just recorded again.
+ - `HIST_IGNORE_ALL_DUPS`, Delete old recorded entry if new entry is a
+duplicate.
+ - `HIST_FIND_NO_DUPS`, Do not display a line previously found.
+ - `HIST_IGNORE_SPACE`, Don't record an entry starting with a space.
+ - `HIST_SAVE_NO_DUPS`, Don't write duplicate entries in the history file.
+ - `HIST_REDUCE_BLANKS`, Remove superfluous blanks before recording entry.
+ - `HIST_VERIFY`, Don't execute immediately upon history expansion.
+ - `HIST_BEEP`, Beep when accessing nonexistent history.
+
+Aliases
+-------
+
+ - `history-stat`, Lists the ten most used commands
+
+Authors
+-------
+
+*The authors of this module should be contacted via the github bug tracker.*
+
+ - [Robby Russell](/robbyrussell)
+ - [Sorin Ionescu](/sorin-ionescu)
+
+[1]: http://zsh.sourceforge.net/Guide/zshguide02.html#l16