Base: Add mktemp(1) man page

Base/usr/share/man/man1/mktemp.md

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+## Name
+
+mktemp - create a temporary file or directory
+
+## Synopsis
+
+```**sh
+$ mktemp [--directory] [--dry-run] [--quiet] [--tmpdir DIR] [template]
+```
+
+## Description
+
+`mktemp` creates temporary a file or directory safely, and then prints its name.
+
+A template may be specified and will be used instead of the default tmp.XXXXXXXXXX
+as long as it contains at least 3 consecutive 'X's.
+
+## Options
+
+* `-d`, `--directory`: Create a temporary directory instead of a file
+* `-u`, `--dry-run`: Do not create anything, just print a unique name
+* `-q`, `--quiet`: Do not print diagnostics about file/directory creation failure
+* `-p`, `--tmpdir`: Create temporary files relative to this directory
+
+## Examples
+
+```sh
+# Create a temporary file
+$ mktemp
+# Find an available temporary file name
+$ mktemp -u
+# Create a temporary directory with a custom template
+$ mktemp -d serenity.XXXXX
+```