Added pamac notes to the knowledge base

knowledge base/linux/pamac.md

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+# Pamac
+
+## TL;DR
+
+```shell
+# check if updates are available (in aur too)
+pamac checkupdates --aur
+
+# delete all unneded packages and their dependencies from the system
+pamac remove --no-save --orphans --unneeded
+```
+
+## Further readings
+
+- Manjaro's [Wiki]
+
+[wiki]: https://wiki.manjaro.org/index.php/Pamac