example: how to build a library in V

[vbrazo]

This should include:

• Creating an application and explaining the pieces that need to be added
• How to add the library to a package manager
• How to include and use the library in a new V application

@nedpals perhaps you could help us with this one?

ps: This is a suggestion for an advanced example in V by example.

[vbrazo]

I think we should move this example to V School. Closing it for now.