added reference to the shell client to :help

share/help.txt

@@ -27,10 +27,18 @@ Special pages:
     :help               this page
     :list               list all cheat sheets
     :post               how to post new cheat sheet
+    :bash               shell client
     :bash_completion    bash function for tab completion
     :styles             list of color styles
     :styles-demo        show color styles usage examples
 
+Shell client:
+
+    $ curl https://cht.sh/:bash > ~/bin/cht.sh
+    $ chmod +x ~/bin/cht.sh
+    $ cht.sh python :learn
+    $ cht.sh --shell
+
 Tab completion:
 
     $ mkdir -p ~/.bash.d/
@@ -60,7 +68,6 @@ List of search options:
     i   case insensitive search
     r   recursive
 
-
 Programming languages topics:
 
 each programming language topic has the following subptopics: