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Launch Visual Studio, Select menu Tools | Extension Manager,
Search online gallery for Git Source Control Provider
Download and install.
Go to Tools | Options.
Select Source Control in the tree view
Select Git Source Control Provider from the drop down list, and click OK.
Also, please verify the paths to your favorited git tools are setup correctly.
Open Git controlled project, the files status are shown.
To create new Git repository for not controlled projects, see Create Git Repository.