xNode through git
Git-fork is a free and well designed git client for Windows and Mac. While it is possible to use git from command-line I heavily recommend getting a client.
Download and install: https://git-fork.com/
If your project is already a git repository: Add xNode as a submodule.
From git-fork, open your project, then right-click *Submodules* on the left panel and hit *Add New Submodule...*
In the dialog box that pops up, paste [email protected]:Siccity/xNode.git into the URL field, and set the folder to Assets/Submodules/xNode.
Note: You can use any other folder as long as it's inside the Assets folder. For example Assets/xNode will work fine as well.
Once you got that done, hit Add Submodule and you're done.
If you don't have your project backed up by git: Clone xNode.
From git-fork, click *File/Clone...*
In the dialog box that pops up, paste [email protected]:Siccity/xNode.git into the URL field, and set the parent folder to wherever you want xNode to be. For example, setting parent folder to C:/Unity/MyProject/Assets Assets/Submodules/xNode.
