add read_csv example to README

[avallecam]

what do you think of adding a reprex to README about how to read the csv inside R?

pros:

• easy reproducibility
• for beginners, accelerate access to data import by copy/paste (path not the same as webpage link)

cons:

• filename in path_file may require to be changed constantly

solution:

• use a background script to create the input string based on the last updated files available in data/ (maybe this could help: https://stackoverflow.com/a/57531884/6702544)

here a minimal reprex to show:

library(tidyverse)
path_file <- "https://raw.github.com/fkrauer/COVID-19/master/data/WHO_COVID19_ALL_ADM0_2020-03-10.csv"
read_csv(file = path_file)
#> # A tibble: 1,768 x 8
#>    date       country adm   n_cum_conf n_cum_deaths n_inc_conf n_inc_deaths
#>    <date>     <chr>   <chr>      <dbl>        <dbl>      <dbl>        <dbl>
#>  1 2020-01-20 Japan   all            1           NA         NA           NA
#>  2 2020-01-20 South ~ all            1           NA         NA           NA
#>  3 2020-01-20 Thaila~ all            2           NA         NA           NA
#>  4 2020-01-21 Japan   all            1           NA         NA           NA
#>  5 2020-01-21 South ~ all            1           NA         NA           NA
#>  6 2020-01-23 Japan   all            1           NA         NA           NA
#>  7 2020-01-23 South ~ all            1           NA         NA           NA
#>  8 2020-01-23 Thaila~ all            4           NA         NA           NA
#>  9 2020-01-23 USA     all            1           NA         NA           NA
#> 10 2020-01-24 Japan   all            1           NA         NA           NA
#> # ... with 1,758 more rows, and 1 more variable: class <chr>

^{Created on 2020-03-11 by the reprex package (v0.3.0)}

I'm open to make a pull request

[fkrauer]

Hi Andree, thanks for the suggestion, I think it's a good idea. Will look into it tomorrow. As for dynamic url, I think that's a bit tricky. I might just rename the files without the last update in the file name and just add the update in the commit message. Hope that's not too confusing for people. But makes reading files easier.