Adding geocode_csv() and geocode_csv_reverse() function

[feddelegrand7]

Hi I've added the following which I think may complement well the current features of the package:

1. Adding the geocode_csv() function
2. Adding the geocode_csv_reverse() function
3. Both function are documented (Rd files added)
4. Both functions are documented within the vignetter Rmd

Best regards.

[joelgombin]

Hi @feddelegrand7 ! Thanks for your PR!

In the present state of {banR} dealing with the CSV files is done under the hood as we were considering the use case where one is working with a tibble/dataframe. But it can be useful to be able to deal with CSV files directly, so I feel the PR is welcome.

I'm not completely comfortable with the API of these functions though. In my opinion, having something like:

geocode_csv(file = "search.csv", 
            columns = "postcode", 
            columns = "adresse")

is not very idiomatic in R.
Maybe it could be something like:

geocode_csv(file = "search.csv", 
            columns = c("postcode", "adresse"))

It would make the function code a bit more convoluted but I feel this syntax would be more natural to R users. What do you think @pachevalier ?

[feddelegrand7]

Hi @joelgombin thanks for your feedback. You're absolutely right, columns = c("postcode", "adresse") would be way more efficient for the end user and is R friendly however to be honest I've tried to pass a vector to the body paramater of the POST() function (and a list also) but it didn't work, that's why I used the .... Any solution for that ?

[pachevalier]

What's the diff with tbl_geocode?