Update README.md

Author: cedricfranke28

README.md

@@ -9,17 +9,21 @@ a fully customable sidebar webcomponent...
 
 sidebar-width -> Change the width of the sidebar (default = 300px)
 
-sidebar-background-color -> Change the backgroundcolor (default = lightgrey)
-
-sidebar-position -> Position of the sidebar left or right (default = right)
-
 sidebar-toggle-button-top-position -> Position of the toggle button depending from top in % (default = 25)
 
 toggle-button-background-color -> Change the backgroundcolor (default = lightgrey)
 
 toggle-button-color -> change color of button icon black or white (default = black)
 
 
+fully customable while using parts. there are three parts defined to use.
+
+sidebar
+
+toggle-button
+
+slot-element
+
 # development
 ## upload new version
 simple run