Please keep in mind that you are looking at somebody else's work. Always credit if you use anything from other peoples' mods, unless it's explicitly stated that you don't have to!
Some modders don't want their mods to be unbundled. Most people don't mind if you do it for your own personal use, but you should seek permission and respect their decision.
For a documentation on how to use Wolvenkit CLI, see here. Unless you have a very good reason to use the console, you probably don't want to.
Select the file that you want to add by checking the box. Then right-click on it, and click on the Add selected items to project option.
Add items to project
That's it! You now have the file in your mod project and can start editing.
Troubleshooting
I can't add anything to my project!
Make sure that you actually have a Wolvenkit project opened (you will see the project name in the top-right corner next to the close button). Can't add files to a project if there's no project!
Everything is scrambled / there are a bunch of .bin files
You have found a mod that is not compatible with the current hashing algorithm. Long (and sad) story short, from time to time that needs an update, and then anything packed with a different version of the algorithm won't resolve anymore.
You can try opening the .archive with Wolvenkit 8.9 or 8.7 - anything older will be incompatible with game versions >= 1.6.
Didn't work
Some authors don't want other people to look at their files and deliberately corrupt their archives to prevent Wolvenkit from reading them. The game is a lot more robust than WKit, so these mods usually work, although side effects can't be ruled out. If none of this works, you can still look at the files and their properties in the File Editor and try to guess what's what. Other than that, you're out of luck, though.