Add old design doc for hinting

doc/hinting.md

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+## Components
+
+ - Iterable of visible links on page
+
+ - Algorithm for choosing hint characters for each link
+
+ - Mode for controller and excmd to refine and select hints:
+     - I imagine `:hint` to start 
+     - `:hint j` to refine to only hints starting with j
+     - `:hint jk` to refine to hints starting with jk
+     - To make maps easier we can have `:hintaddchar j` and have the state of the current hintstr stored content-side.
+
+## Improvements
+
+Hinting modes should be flexible on both
+
+ 1. What is hinted (links, anchorpoints, frames, input elements, etc)
+ 2. What is done with the selected link (follow, yank, focus)
+
+## Vimperator hint modes:
+
+`:help` hinttags
+
+```
+string(default: //input[not(@type='hidden' or @disabled)] | //xhtml:input[not(@type='hidden')] | //a | //xhtml:a | //area | //xhtml:area | //iframe | //xhtml:iframe | //textarea | //xhtml:textarea | //button | //xhtml:button | //select | //xhtml:select | //\*[@onclick or @onmouseover or @onmousedown or @onmouseup or @oncommand or @role='link'or @role='button' or @role='checkbox' or @role='combobox' or @role='listbox' or @role='listitem' or @role='menuitem' or @role='menuitemcheckbox' or @role='menuitemradio' or @role='option' or @role='radio' or @role='scrollbar' or @role='slider' or @role='spinbutton' or @role='tab' or @role='textbox' or @role='treeitem' or @tabindex])
+        
+XPath string of hintable elements activated by f and F
+```
+
+Extended hint modes:
+
+```
+;  Focus hint 
+?  Show information for hint 
+s  Save link 
+S  Save object 
+a  Save link with prompt 
+A  Save object with prompt 
+f  Focus frame 
+o  Follow hint 
+t  Follow hint in a new tab 
+b  Follow hint in a background tab 
+w  Follow hint in a new window 
+F  Open multiple hints in tabs 
+O  Generate an ':open URL' using hint 
+T  Generate a ':tabopen URL' using hint 
+W  Generate a ':winopen URL' using hint 
+v  View hint source 
+V  View hint source in external editor 
+y  Yank hint location 
+Y  Yank hint description 
+#  Yank hint anchor URL
+c  Open context menu 
+i  Show media object 
+I  Show media object in a new tab 
+x  Show hint's title or alt text
+```