add readme

README.md

+# alapur
+
+## Prerequisite
+
+Install the "remotes" R-package
+```R
+source("https://raw.githubusercontent.com/r-lib/remotes/master/install-github.R")$value("r-lib/remotes")
+```
+
+## Installation
+
+```R
+library("remotes")
+remotes::install_git("git@git.nilu.no:alapu/alapur.git")
+
+```