Add RTD config file

[browniebroke]

As per #135 adding the config file for read the docs, which required since September 2023.

Someone with admin access might have to re-enable webhooks from here https://readthedocs.org/dashboard/django-hosts/integrations/

You can get a preview of the docs on each PR by ticking this checkbox on this page https://readthedocs.org/dashboard/django-hosts/edit/

See it on my fork: browniebroke#1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (17fc0b6) to head (f262d34).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #167   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           11        11           
  Lines          400       400           
  Branches        68        68           
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  Hits           400       400           

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[hramezani]

I don't have admin access.
Probably @jezdez can help

[browniebroke]

Any chance we could get this sorted @jezdez please? Should we consider migrating this repo to @django-commons?