Describe option to build debug configuration with VSCode (#366)

This is already described somewhere else but is missing here.

projectconf/build_configurations.rst

@@ -40,6 +40,7 @@ PlatformIO:
 If you need to build a project in ``debug`` configuration, please use one of
 these options:
 
+* In :ref:`ide_vscode`: Use build option **Pre-Debug** or **Pre-Debug All** in the ``Project Tasks`` menu.
 * Add :ref:`projectconf_build_type` with ``debug`` value to :ref:`projectconf`
 * Use :ref:`cmd_debug` command.