Add doc for development/contributing

[dfockler]

It may be my Python inexperience, but I'm not sure how to get my modified scrapyd code to run from the project root, or how to run tests or anything.
Any help would be appreciated, Thanks.

[jayzeng]

Sounds like you have pulled this repo to your local machine, you can do sudo python setup.py install. And I agree we should have docs covered the details, interested in sending in a PR after you go through the entire process?

[jpmckinney]

This repo doesn't receive many contributions, so this is not a high priority.

That said, it is just:

git clone git@github.com:scrapy/scrapyd.git # or your fork
pip install pytest -e .
pytest

So the same as any other Python package that uses pytest.

[jpmckinney]

Actually, the docs are here: https://scrapyd.readthedocs.io/en/stable/contributing.html