Added timemachine notes to the knowledge base

knowledge base/timemachine.md

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+# TimeMachine
+
+## TL;DR
+
+```shell
+# follow logs
+log stream --style syslog --predicate 'senderImagePath contains[cd] "TimeMachine"' --info --debug
+
+# add or set a destination
+sudo tmutil setdestination
+```
+
+## Follow logs
+
+- use `stream` to keep watching "tail style"
+- use `--predicate` to filter out relevant logs
+- add `--style syslog` to watch them in a syslog style