Add a very simple plugin to call issue Dash queries from the command-line

plugins/dash/README.md

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+## dash
+
+**Maintainer:** [@MattLewin](https://github.com/MattLewin)
+
+This plugin supplies an easy way to query Dash from the command-line
+
+### Usage
+
+$ dash *\<query\>* (Ex.: `dash bash` ) 
+	
+$ dash *\<keyword\>:\<query\>* (Ex.: `dash ios:UITableView` )
+
+Note that *<keyword>* is the keyword associated with the docset, as shown on the Docsets preference pane of Dash preferences.
+ 

plugins/dash/dash.plugin.zsh

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+# Send everything on the command line to Dash, without having to
+# type the whole 'open "dash://" business
+function dash() {
+	open "dash://$1"
+}