Add citation info to PDF

Change-Id: Ic250ee6edc9149cf9ac816b911eea165d86ac71c
diff --git a/R/rderekovecs-package.R b/R/rderekovecs-package.R
index e6a755d..82585fd 100644
--- a/R/rderekovecs-package.R
+++ b/R/rderekovecs-package.R
@@ -1,4 +1,9 @@
-#' @keywords internal
+#' @references Type
+#' `citation(rderekovecs)`
+#' to see how to refer to this package
+#' @details Package version `r as.character(packageVersion("rderekovecs"))`
+#'
+#'
 "_PACKAGE"
 
 ## usethis namespace: start
diff --git a/man/rderekovecs-package.Rd b/man/rderekovecs-package.Rd
index 01c8913..bca79b4 100644
--- a/man/rderekovecs-package.Rd
+++ b/man/rderekovecs-package.Rd
@@ -8,6 +8,14 @@
 \description{
 A client package that makes the 'DeReKoVecs' web service API accessible from R.
 }
+\details{
+Package version 0.1.0
+}
+\references{
+Type
+\code{citation(rderekovecs)}
+to see how to refer to this package
+}
 \seealso{
 Useful links:
 \itemize{
@@ -20,4 +28,3 @@
 \strong{Maintainer}: Marc Kupietz \email{kupietz@ids-mannheim.de}
 
 }
-\keyword{internal}