main: Add basic help output
authorKarl Palsson <karlp@remake.is>
Wed, 3 Feb 2016 17:11:57 +0000 (17:11 +0000)
committerJo-Philipp Wich <jow@openwrt.org>
Wed, 3 Feb 2016 18:16:34 +0000 (19:16 +0100)
Add basic usage text to the binary and print it when invoked with -h
or with no arguments at all.

Signed-off-by: Karl Palsson <karlp@remake.is>
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

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