add GUI screenshot

README.md

@@ -44,6 +44,7 @@ So this tool aims to get rid of the app by parsing data from _MyMüll.de_ web se
 - press _sync events_ button and wait for completion.
 - if you want do erase all former created events by this app, press _delete existing events_ button.
 
+![GUI](./doc/GUI.png)
 
 ## Disclaimer
 This tool was developed by an annoyed _MyMüll.de_ app user as a free contribution 

mymuell2caldav.py

@@ -247,7 +247,7 @@ class MyMuell2CalDavGui(QMainWindow):
         self._calendarNames.setContentsMargins(0, 10, 0, 10)
 
         # self.setGeometry(300, 300, 1000, 800)
-        self.setMinimumWidth(800)
+        self.setMinimumWidth(500)
         self.setWindowTitle("MyMuell DAV GUI")
 
     def slot_process_finished(self, result: bool, msg: str):