OPUS20: README file for PCASpy-based IOC

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+## LUFFT\_OPUS20 - EPICS IOC
+
+### Installation / Requirements
+
+    pip install --upgrade -r requirements.txt
+
+### Starting
+
+    $ ./lufft_opus20_ioc.py -h
+    usage: lufft_opus20_ioc.py [-h] --sys SYS --sub SUB --esys ESYS
+                               opus20_hostname
+    
+    positional arguments:
+      opus20_hostname  The hostname of IP address of the OPUS20 logger.
+    
+    optional arguments:
+      -h, --help       show this help message and exit
+      --sys SYS        The detector system
+      --sub SUB        The detector sub-system
+      --esys ESYS      The environmental sub system
+
+For example:
+
+    ./lufft_opus20_ioc.py --sys CBM --sub MVD --esys CLEANROOM 192.168.1.12
+
+Will serve the following PVs:
+
+* CBM:MVD:ENVIRON:CLEANROOM:Temperature
+* CBM:MVD:ENVIRON:CLEANROOM:RelativeHumidity
+* CBM:MVD:ENVIRON:CLEANROOM:AbsoluteHumidity
+* CBM:MVD:ENVIRON:CLEANROOM:Dewpoint
+* CBM:MVD:ENVIRON:CLEANROOM:BatteryVoltage
+