update README

README.md

@@ -2,23 +2,34 @@
 
 ## Installation
 
+* method A:
 To install the latest version of HTRfit, run the following in your R console :
-
 ```
 if (!requireNamespace("remotes", quietly = TRUE))
     install.packages("remotes")
 remotes::install_git("https://gitbio.ens-lyon.fr/aduvermy/HTRfit")
 ```
 
-When dependencies are met, installation should take under 20 seconds.
+* method B:
+
+Alternatively, you can download a release on https://gitbio.ens-lyon.fr/aduvermy/HTRfit/-/releases. 
+Then, run the following in your R console:
+
+```
+## -- example with release HTRfit-v1.0.0
+install.packages('/HTRfit-v1.0.0', repos = NULL, type='source')
+```
+
+When dependencies are met, installation should take a few minutes.
 
 
 ## CRAN packages dependencies
 
+The following depandencies are mandatory:
+
 ```
-install.packages(c("car", "parallel", "data.table", "ggplot2", "gridExtra", 
-                    "glmmTMB", "magrittr", "MASS", "plotROC", "reshape2", 
-                    "rlang", "S4Vectors", "stats", "utils"))
+install.packages(c('car', 'parallel', 'data.table', 'ggplot2', 'gridExtra', 'glmmTMB', 'magrittr', 'MASS', 'plotROC', 'reshape2', 'rlang', 'stats', 'utils', 'BiocManager'))
+BiocManager::install('S4Vectors', update = FALSE)
 ```
 
 ### System requirements