@PoojaK386 The Pega Robotics Plugin for Visual Studio is only available for Visual Studio 2015. Pega Robotics V21 will be released soon and will no longer be integrated with Visual Studio. You may download a preview release now if you would like to check it out.
@PoojaK386 If you installed the plugin for Visual Studio 2015, then you can create a new robotics project right from VS2015. From the File menu is VS2015, you should see an option under "New" for "Pega Robot New Project Wizard". You don't need to add anything to Visual Studio once you've installed the plugin.