changed readme

README.md

@@ -3,6 +3,11 @@
 
 Place clickable animations on a background image.  
 
+How to install:  
+Get Processing 3 from http://processing.org/
+Install the "Drop"-library. It is available in Processings internal library database.  
+"Sketch" -> "Import　Library" ->　"Add Library" -> Search and install "Drop"  
+  
 How to use:  
 To import an animation, drag and drop a folder from your file system to the gse-window.  
 You can use the example_animation folder and just throw it in the water, I recommend.