Add infos about the udata.cfg file in docs/development

[JulienParis]

Some bit of information is missing from the current documentation to allow uploads locally in a development environment

Detailed Description

If you are just following the docs from this page your instance of udata does not allow you to upload files/resources locally on a dataset and returns you a 500 error.

Possible Implementation

We could :

• provide an example of a udata.cfg file content in the documentation something like :

from udata.settings import Defaults

DEBUG = True
SEND_MAIL = False
SERVER_NAME = 'dev.local:7000'

#THEME = 'default'
#CACHE_TYPE = 'null'

URLS_ALLOW_PRIVATE = True
URLS_ALLOW_LOCAL = True
URLS_ALLOWED_TLDS = Defaults.URLS_ALLOWED_TLDS | set(['local'])

RESOURCES_FILE_ALLOWED_DOMAINS = ['*']

• explain how to set up your machine to associate dev.local to your 127.0.0.1

# edit your hosts file
nano ~/etc/hosts

# add the "dev.local" line and save
# 127.0.0.1       localhost
127.0.0.1       dev.local

... and explain where this file should go