add installation directives

README.md

@@ -3,6 +3,13 @@
 R package to analyze parliamentary records of the 19th legislative period of the Bundestag,
 the German parliament.
 
+# Installation
+
+Using the `remotes` package, this is easily installed via:
+```r
+remotes::install_url("https://git.flavigny.de/christian/hateimparlament/archive/master.zip")
+```
+
 # Features
 
 The package mainly supplies 4 functionalities: