add small description at top of readme

README.md

@@ -1,3 +1,13 @@
+# forked from [Evidlo](https://github.com/Evidlo/remarkable_keyboard/blob/master/remarkable_keyboard/mappings.py)
+
+This adds touchpad functionality, so it is possible to make relative mouse movements with fingers on the touchscreen
+while it is still possible to use the stylus for absolute mouse movement.
+
+this is more like a quick hack, so there are probably many possiblitys for improvements.
+
+When doing slow movements, the mouse seems to stutter a bit (fine when moving faster).
+Have not looked into what is causing that...
+
 # remarkable_mouse
 
 Use your reMarkable as a graphics tablet.