From Visual Studio Gallery
http://visualstudiogallery.msdn.microsoft.com/aabd3f1e-fd57-43f5-8dde-54dd0355defe

This unofficial extension allows you to create basic OpenUI5 Apps
that will run with IIS and an ASP.NET Web Project. 
It contains a project template that will allow you to create either 
a desktop or mobile HTML5 application for the SAP UI5 framework. 

- Desktop or Mobile Application Creation project template
- I18n Properties project item template
- SAP UI5 View Templates (XML, HTML, JSON, JS) item template
- Intellisense Works on the index.html file be default in VS
- Javascript intellisense for the framework

- OData ASP.NET Web Api integration(C#)
- XML View Editor.
- Build Add-on to minimize CSS and View/Controller Code for better performance and secruity.

If you are having an difficulties using the extension, or want an additional feature or to report a bug.  Please report it on github.