This is a Custom Claims Provider Feature Receiver Item Template based on the MSDN Sample available in the MSDN Code Gallery titled "Writing Claims Providers for SharePoint 2010". The entire code sample can be downloaded here: http://code.msdn.microsoft.com/SharePoint-2010-Writing-87dbee1d
The Claims Provider walkthrough can be reviewed here: http://msdn.microsoft.com/en-us/library/ff699494.aspx
Of course, the unfortunate part of the code sample provided in the MSDN Code Gallery is that the solution file is not part of a SharePoint project!!
This means that you have to create an Empty SharePoint project and then add the necessary class file to your project so that you can publish your Custom Claims Provider Feature Receiver as a Farm-level Feature. The Feature Receiver is used to provide easy activation of your Custom Claims Provider Solution in the SharePoint Farm.
Therefore, this Item Template is available to make it easier to simply add your Custom Claims Provider Feature Receiver directly to your Empty SharePoint project.
NOTE: Since the Custom Claims Provider Feature Receiver is dependent on a Custom Claims Provider, several TODO Items have been added into the code base to ensure that the appropriate code segments are replaced to correspond with your ACTUAL Custom Claims Provider name and description. The Custom Claims Provider Feature Receiver will not compile and deploy properly in your SharePoint project if these changes are not made.