If you are using Sitecore Rocks and you want newly created items to show up automatically in the TDS project you have in your solution without doing any extra operations – except save the project and add the new files to git and then commit/push – then a plugin for Sitecore Rocks has to be installed.
In Visual Studio follow the steps to install the plugin TDS2 Rocks Connector:

and

I just need to remind you that you need Team Development for Sitecore and Sitecore Rocks installed.
Cheers.