Add: tutorial on how to setup a Python testing envt using hatch to our tutorials

[lwasser]

This follows @npch comment here: https://pyopensci.discourse.group/t/some-experiences-of-doing-a-pyopensci-review/29/2?u=lwasser

Essentially someone newer to package development might not know how to setup a Python Envt with items needed to run tests locally. We should add a tutorial in the tutorial section of our guidebook that teaches someone to setup and run tests.

I think it should include a tutorial on setting up testing environments with hatch (i created a nice tutorial on the hatch docs on environments for reference here!).

I think the sections would look something like

1. What is testing / why is it important?
2. What is a python envt? why is it useful and how (one way to) set one up?
3. What to look for in contributing guidelines for this setup information

[choldgraf]

Note - I added another page for this so that we could expand upon it with content like the one described here:

https://www.pyopensci.org/dev_guide/authoring/testing.html

One thing to note is that we don't want to re-invent the wheel. We should link out to things like software carpentry as much as possible

[lwasser]

Wow - this is a really old issue! BUT i think this would be a good addition tl our packaging guide tutorials using hatch the setup is actually really straight forward. i'm going to move this to the other repo, tag it as help-wanted.

i'll also update the top header to be more specific

[lwasser]

@all-contributors pleaes add @choldgraf for code, review

[allcontributors]

@lwasser

I've put up a pull request to add @choldgraf! 🎉

[lwasser]

@all-contributors please add @npch for review

[allcontributors]

@lwasser

I've put up a pull request to add @npch! 🎉