DOC: add doc notes

docs/source/upcoming_release_notes/1199-cool-updates.rst

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+1199 cool-updates
+#################
+
+API Breaks
+----------
+- N/A
+
+Features
+--------
+- create a new sub module `pc.py`
+
+Device Updates
+--------------
+- in `atm.py` add `flow_meter` to `ArrivalTimeMonitor`
+- in `attenuator.py` add `flow_meter` to `AttenuatorSXR_Ladder`
+- in `attenuator.py` add `flow_meter` to `AttenuatorSXR_LadderTwoBladeLBD`
+- in `device_types.py` add `WaveFrontSensorTargetCool` , `WaveFrontSensorTargetPF2K2`
+- in `mirror.py` add flow sensor variable to `FFMirror`
+- in `wfs.py` add `flow_meter` to `WaveFrontSensorTarget`
+
+New Devices
+-----------
+- add class `PhotonCollimator` to readout `flow_switch`
+- add class `WaveFrontSensorTargetPF2K2` to readout `flow_switch`
+
+Bugfixes
+--------
+- N/A
+
+Maintenance
+-----------
+- N/A
+
+Contributors
+------------
+- nrwslac