title: Add existing project to existing git repository
body: <p>I've got a Visual Studio solution already part of a git repository on TFS.  The solution consists of a number of projects.  Everything was fine until recently I renamed one of the projects.  I've noticed that the renamed project has dropped out of the repository and I can't figure out how to get it back in.</p>
  
  <p>Googling reveals a lot of information about adding existing solutions to new git repositories, but I can't find any advice on how to fix the situation I find myself in.  I'm a git noob which certainly isn't helping; I can't even figure out got to call git from the command line.</p>
  
  <p>Surely there's a simple sequence of git commands to get my project back in the repository?</p>