Extend page on including data in your package

[namurphy]

The page on how to include data in a package still needs to be written. Just to brainstorm, some of the topics could be:

• where to put data files
• accessing files (probably using pkg_resources?)
• dealing with large data files with git-lfs (and any good alternatives to git-lfs)

I'm also curious if there's a way to store data files on, say, the Zenodo online archive so that they can be downloaded during package setup or installation.

[Cadair]

This has also recently been written if you have any feedback.

[Cadair]

I think it would be good to at least cover accessing data from within your code.