Création d'un fichier de citation

Signed-off-by: Olivier Delaigue <olivier.delaigue@irstea.fr>

inst/CITATION

+citHeader("To cite airGR in publications use these references:")
+
+citEntry(entry="Article",
+	title = "airGR: A suite of lumped hydrological models in an R-package",
+        author = personList(as.person("L. Coron"), as.person("C. Perrin"), as.person("O. Delaigue"), as.person("G. Thirel"), as.person("V. Andréassian")),
+	journal = "Environmental Modelling and software",
+  	year = "in prep.",       
+        textVersion = 
+        paste("Coron, L., Perrin, C., Delaigue, O., Thirel, G. and Andréassian, V. ",
+	       "(in prep.): ", 
+               "airGR: A suite of lumped hydrological models in an R-package. ",
+               "Environmental Modelling and software. ",
+               sep="")
+         )
+
+citEntry(entry="Manual",
+	title = "airGR: Suite of GR hydrological models for precipitation-runoff modelling",
+        author = personList(as.person("L. Coron"), as.person("C. Perrin"), as.person("C. Michel")),
+	journal = "R News",
+  	year = "2016",
+    note = "R package version 0.9.0.1",
+    url = "http://webgr.irstea.fr/modeles/?lang=en",
+        textVersion = 
+        paste("Coron, L., Perrin, C., Michel, C. ",
+	       "(2016): ", 
+               "airGR: Suite of GR hydrological models for precipitation-runoff modelling. ",
+               "R package version 1.0.0.0. ",
+               "http://webgr.irstea.fr/modeles/?lang=en",
+               sep="")
+         )