Base: Add more manpages for command-line utilities

Base/usr/share/man/man8/hostname.md

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+## Name
+
+hostname - print or set hostname
+
+## Synopsis
+
+```**sh
+$ hostname [hostname]
+```
+
+## Description
+
+`hostname` prints current host name. If the `hostname` argument is give and the user is a superuser, the utility sets the current host name to its value. The maximum hostname length is 64 characters. The hostname is not persisted after reboot.
+
+## Examples
+
+```sh
+# Print current hostname
+$ hostname
+courage
+
+# Set the new hostname
+# hostname foo
+
+# Print new hostname
+# hostname
+foo
+```