Improved documentation for asset generation

Change-Id: I96f24fe034a141fdf357275f42d3b2782112d9af
diff --git a/README.md b/README.md
index 09d2480..3fb63d5 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,17 @@
 For processing Sass, you will need Ruby with
 the ```sass``` gem in addition.
 This will probably need administration
-rights. 
+rights, depending on your installation path.
+These tools may also be available with a package manager.
+
+You can check, if all tools are available using
+
+```
+$ npm -v
+$ sass -v
+```
+
+Afterwards you can install grunt and run grunt to create the assets.
 
 ```
 $ cd Kalamar
@@ -33,6 +43,8 @@
 $ grunt
 ```
 
+Whenever the assets change, just rerun ```grunt```.
+
 ### Start Server
 
 Kalamar uses the [Mojolicious](http://mojolicio.us/) framework,