readme update

README.md

@@ -9,11 +9,22 @@ The aim of this package is to provide a full genomic features annotation from ge
 ## Installation
 
 ```r
+## using install_gitlab
 remotes::install_gitlab(
     "aurelien.brionne/GenomeFeatures",
     host = "forgemia.inra.fr",
     build_opts = c("--no-resave-data", "--no-manual")
 )
+
+## alternative (from local directory)
+    # clone package (from prompt)
+    git clone https://forgemia.inra.fr/aurelien.brionne/GenomeFeatures.git
+
+    # build package (from R console) 
+    devtools::build("GenomeFeatures")
+
+    # install package (from R console)
+    install.packages("GenomeFeatures_1.0.tar.gz", repos = NULL, type = "source")
 ```
 
 ## Quick overview