update DESCRIPTION file

DESCRIPTION

 Package: TCNtools
-Title: What the Package Does (One Line, Title Case)
+Title: Terrestrial Cosmogenic Nuclides Calculation
 Version: 0.1
 Authors@R: 
     person(given = "Vincent",
            family = "Godard",
            role = c("aut", "cre"),
            email = "godard@cerege.fr",
-           comment = c(ORCID = "YOUR-ORCID-ID"))
-Description: What the package does (one paragraph).
-License: What license it uses
+           comment = c(ORCID = "0000-0003-0143-5893"))
+Description: Terrestrial Cosmogenic Nuclides (TCN) utilities for the the analysis of complex exposure and erosion histories of the Earth surface
+License: GPL-3
 Encoding: UTF-8
 LazyData: true
 RoxygenNote: 7.1.1