Added freebsd's notes to the knowledge base

knowledge base/freebsd.md

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+# FreeBSD
+
+## TL;DR
+
+```shell
+# Initialize package managers.
+portsnap auto
+pkg bootstrap
+```
+
+## Utilities worth noticing
+
+- `bsdinstall`
+- `bsdconfig`
+
+## NTP time sync
+
+```conf
+# file /etc/rc.conf
+ntpd_enable="YES"
+ntpd_sync_on_start="YES"
+```
+
+## Sources
+
+- [Ports]
+- [NTPdate - not updating to current time]
+- [Boinc]
+- [sbz's FreeBSD commands cheat-sheet]
+
+[boinc]: https://people.freebsd.org/~pav/boinc.html
+[ntpdate - not updating to current time]: https://forums.freebsd.org/threads/ntpdate-not-updating-to-current-time.72847/
+[ports]: https://docs.freebsd.org/en/books/handbook/ports/
+[sbz's freebsd commands cheat-sheet]: https://github.com/sbz/freebsd-commands