This is a simple editor script that adds a new menu item, "Sync Solution", to the Assets menu. This menu item will synchronize the C# project and solution without opening it. This is useful if you prefer to use Sublime Text or other editors using Omnisharp where you need the solution and projects but don't actually need to directly open them.
The menu item also binds Shift-Alt-S to the functionality, for quicker access when working. If you add/remove scripts, a quick Shift-Alt-S will ensure your projects are updated.
This script is based on this post on Unity Answers.