Description for scheduling window logs.

docs/data/withSpsEnabled/SchedulingWindow.md

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+# Scheduling Window
+
+Every time _Elektron_ switches to a different scheduling policy, the size of the scheduling window and the name of the scheduling policy is logged.
+
+The logs are written to a file named _\<logFilePrefix\>\_\<timestamp\>\_schedWindow.log_, where
+* _logFilePrefix_ is the prefix provided using the `-logPrefix` option.
+* _timestamp_ corresponds to the time when _Elektron_ was run.
+
+The format of the data logged is as shown below.
+```
+<yyyy/mm/dd> <hh:mm:ss> <sched window size> <sched policy name>
+```