Add instructions and purpose to README

Author: bdukes

InstallPackages/bootstrap.accessibility_1.0.4.zip

@@ -1,11 +1,59 @@
 DNN JavaScript Libraries
 ===============
 
-This repository contains DNN JavaScript Library extensions, wrapping some common
-JavaScript libraries for use in DNN.
+Version 7.2 of the [DNN Platform](http://www.dnnsoftware.com) introduced the
+JavaScript Library extension type. This allows common JavaScript libraries to 
+exist in a single place within a DNN site, instead of every module, skin, and 
+piece of content that wants to include them using their own. DNN presently 
+comes with libraries for jQuery, jQuery UI, jQuery Migrate, Knockout, and 
+Knockout Mapping.
+In addition to these built-in libraries, new libraries can be installed into 
+DNN, and used by various components.  DNN allows multiple versions of a
+JavaScript library to be used, so one module can request a particular version
+of a script, while another requests another. So long as they aren't on the same
+page, they will get what they requested; otherwise, DNN will use the higher 
+version.
+
+Goal
+===============
+
+The main benefits in using JavaScript Libraries are realized when they are used
+by many separate components within a DNN site (i.e. when there is one common 
+set of libraries and separate, unrelated DNN skins and modules use those 
+libraries instead of packaging scripts directly into the extension). In order
+to aid in that goal, we are attempting to create a central repository 
+of common JavaScript Libraries that can be used by many different DNN extension
+developers. 
+
+Usage
+===============
+
+Skins
+---------------
+Starting in DNN 7.3, there is a skin object called `JavaScriptLibraryInclude`
+which can be used to request a JavaScript library (including jQuery, but also
+any 3rd party library) from a skin. To do that, you need to register the skin
+object at the top of your skin:
+
+    <%@ Register TagPrefix="dnn" TagName="JavaScriptLibraryInclude" Src="~/admin/Skins/JavaScriptLibraryInclude.ascx" %>
+
+Then, in the body of the skin, use the skin object to request the library:
+
+    <dnn:JavaScriptLibraryInclude runat="server" Name="jQuery" />
+    <dnn:JavaScriptLibraryInclude runat="server" Name="jQuery-UI" Version="1.10.3" />
+    <dnn:JavaScriptLibraryInclude runat="server" Name="jQuery-Migrate" Version="1.2.1" SpecificVersion="LatestMajor" />
+
+HTML Skins
+---------------
+The skin object mentioned above can also be used from HTML skins.  It would look something like this:
+
+    <object codetype="dotnetnuke/server" codebase="JavaScriptLibraryInclude">
+        <param name="Name" value="jQuery" />
+        <param name="Version" value="1.9.1" />
+    </object>
 
 License
--------
+---------------
 
 This code is released under the [MIT license](LICENSE.md).  
-However, the individual libraries are licensed by their respective owners.
+However, the individual libraries are licensed by their respective owners.