Update readme file section on known issues

Author: pmoura

README.md

@@ -305,6 +305,8 @@ Code issues detected when running the "Make - Check" or "Make - Circular" comman
 
 On Windows systems, the file paths on the "Problems" pane may not be relative to the workspace directory depending on the Prolog backend. This is a consequence of some backends "normalizing" file paths in a way that seem to break VSCode computing of the relative paths. E.g. paths are relative when using GNU Prolog but absolute when using SWI-Prolog or SICStus Prolog.
 
+On Windows systems, when using backends that "normalize" file paths (e.g. SWI-Prolog and SICStus Prolog), it's currently not possible to use the "Run" menu items to set breakpoints.
+
 On Windows systems, some Prolog backends such as ECLiPSe and XSB are not usable due to file path representation issues. Also, using GNU Prolog requires the following setting:
 
     "terminal.integrated.env.windows": {