Add history-substring-search readme

plugins/history-substring-search/README.md

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+history-substring-search
+========================
+
+This is a clean-room implementation of the [Fish shell][1]'s history search
+feature, where you can type in any part of any previously entered command
+and press the `UP` and `DOWN` arrow keys to cycle through the matching commands.
+
+Settings
+--------
+
+### Case sensitivity
+
+To enable case-sensitive search, add this line to the configuration file:
+
+    zstyle ':omz:plugin:history-substring-search' case-sensitive 'yes'
+
+### Highlighting
+
+If colours are enabled, _history-substring-search_ will automatically highlight
+positive results.
+
+To enable highlighting for this plugin only:
+
+    zstyle -t ':omz:plugin:history-substring-search' color 'yes'
+
+Authors
+-------
+
+*The authors of this plugin should be contacted via the github bug tracker.*
+
+ - [Sorin Ionescu](/sorin-ionescu)
+ - [Suraj N. Kurapati](/sunaku)
+
+[1]: http://fishshell.com