Add of withdrawal-resources

[AndreasSchultzGEA]

No description provided.

[cookeac]

Suggesting a bit more detail in description to help people understand types of use cases. I also wondered if this should be just a resource or an event - I think either could work.

[cookeac]

Looks good now.

[erwinspeybroeck]

also ok for me

[cookeac]

@AndreasSchultzGEA GitHub says that the branch has conflicts that must be resolved.
The issue is simply that the milkURLScheme.json in this PR has different tab indentation on its lines than that in the Develop branch. Therefore it looks like every line has changed, while in the meantime there have been minor changes to the version in the Develop branch. I think if you reformat this file with the smaller spacing that is in the existing file, it should merge fine.

Also there is a warning on line 519 - the "operation" for "get existing milking-withdrawals" must not have spaces (currently it does have spaces).

I tried to make the changes and add them to your branch, but of course I don't have permission.

[AndreasSchultzGEA]

finally, I re-fixed the formatting

[cookeac]

Adds withdrawal resource, resolves #318