Add GSODR.R to create helpfile for package

suggested by @jefferyhanson

R/GSODR.R

@@ -0,0 +1,24 @@
+#' GSODR: Global Surface Summary Daily Weather Data in R.
+#'
+#'The GSODR package is an R package that provides a function that
+#'automates downloading and cleaning data from the "Global Surface
+#'Summary of the Day (GSOD)" weather station data provided by the US National
+#'Climatic Data Center (NCDC). Station files are individually checked for number
+#'of missing days to assure data quality, stations with too many missing
+#'observations are omitted. All units are converted to International System of
+#'Units (SI), e.g., inches to millimetres and Fahrenheit to Celsius. Output is
+#'saved as a Comma Separated Value (CSV) file or in a spatial GeoPackage
+#'(GPKG) file, implemented by most major GIS software, summarising each
+#'year by station, which also includes vapour pressure and relative
+#'humidity variables calculated from existing data in GSOD.
+#'
+#' @section GSODR functions:
+#' \code{\link{get_GSOD}}
+#'
+#' \code{\link{nearest_stations}}
+#'
+#' @section References:
+#' \url{https://data.noaa.gov/dataset/global-surface-summary-of-the-day-gsod}
+#' @docType package
+#' @name GSODR
+NULL