Added help for the keyboard preference panel

Author: dafi

README.md

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+# Installation
+
+### Prerequisites
+
+Works with brew
+
+gem install jekyll
+gem install nokogiri
+gem install rdiscount

preferences/prefsKeyboard.md

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+---
+permalink: preferences/prefsKeyboard.html
+layout: default
+
+# mainAnchor is used by Apple links
+mainAnchor: prefsKeyboard
+title: Keyboard Shortcuts
+subtitle: Application Preferences - Keyboard
+
+# We are a level down the root directory
+# so specify a page prefixDir to search a directory level up
+prefixDir: ../
+---
+
+# ESC key closes documents/application
+
+Together with standard shortcuts to close document windows (Cmd-W) and application (Cmd-Q) it's possible to use the ESC key to close current window, when pressed on the last open window the application quits.