Add news for 4412

Author: jenshnielsen

docs/changes/newsfragments/4412.improved

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+`InstrumentBase.add_parameter` now returns the created parameter.
+This allows explicitly assigning the parameter as an attribute on
+the instrument class. This in turn enables type checkers and
+documentation tools to detect the existence and type of the
+parameter statically.
+
+QCoDeS ships with a tool to automatically refactor instruments in this way.
+
+See `Creating-Instrument-Drivers <../examples/writing_drivers/Creating-Instrument-Drivers.ipynb>`__
+for more details.
+
+It is the plan to transform all drivers shipping with QCoDeS in this way
+as soon as possible.