freebsd, netbsd: add directory; pkg, pkgin: add page

pages/freebsd/pkg.md

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+# pkg
+
+> FreeBSD package manager.
+> More information: <https://man.freebsd.org/cgi/man.cgi?query=pkg&sektion=8>.
+
+- Upgrade all packages:
+
+`pkg upgrade`
+
+- Search for a package:
+
+`pkg search {{keyword}}`
+
+- Install a new package:
+
+`pkg install {{package}}`
+
+- Delete a package:
+
+`pkg delete {{package}}`
+
+- List installed packages:
+
+`pkg info`
+
+- Remove unneeded dependencies:
+
+`pkg autoremove`

pages/netbsd/pkgin.md

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+# pkgin
+
+> Manage pkgsrc binary packages on NetBSD.
+> More information: <https://pkgin.net/#usage>.
+
+- Upgrade all packages:
+
+`pkgin full-upgrade`
+
+- Search for a package:
+
+`pkgin search {{keyword}}`
+
+- Install a package:
+
+`pkgin install {{package}}`
+
+- Remove a package and its dependencies:
+
+`pkgin remove {{package}}`
+
+- List installed packages:
+
+`pkgin list`
+
+- Remove unneeded dependencies:
+
+`pkgin autoremove`