Add man page

Signed-off-by: William Brawner <me@wbrawner.com>

CMakeLists.txt

@@ -25,3 +25,5 @@ project(
 
 add_subdirectory(src)
 
+add_subdirectory(doc)
+

doc/CMakeLists.txt

@@ -0,0 +1,3 @@
+if(PIHELPER_EXECUTABLE)
+    install(FILES pihelper.1 DESTINATION "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}/man/man1")
+endif()

doc/pihelper.1

@@ -0,0 +1,84 @@
+.TH PIHELPER 1 2020-01-10 "PiHelper 0.1.0"
+.SH NAME
+pihelper \- enable, disable, or view the status of a Pi-hole
+.SH SYNOPSIS
+.B pihelper [
+.I options
+]
+.SH DESCRIPTION
+Pihelper is a command-line utility used to enable, disable, or view the status of a given Pi-hole. It supports using alternative configuration files in order to manage multiple Pi-holes.
+.SH OPTIONS
+.IP "-c, --configure"
+.RS
+Create (or replace) the pihelper configuration.
+.RE
+.IP "-d, --disable <seconds>"
+.RS
+Disable the Pi-hole for a given number of seconds.
+.br
+.br
+If no argument is passed, disable the Pi-hole permanently.
+.RE
+.IP "-e, --enable"
+.RS
+Enable the Pi-hole.
+.RE
+.IP "-f, --file <file>"
+.RS
+Use the given configuration file.
+.RE
+.IP "-h, --help"
+.RS
+Display the help message.
+.RE
+.IP "-q, --quiet"
+.RS
+Suppress all output.
+.RE
+.IP "-v, --verbose"
+.RS
+Print additional output.
+.RE
+.SH EXIT STATUS
+The exit status for
+.B pihelper
+is dependent upon the status of the Pi-hole.
+.IP \-1
+.B pihelper
+was unable to connect to the Pi-hole.
+.IP 0
+The Pi-hole is enabled
+.IP 1
+The Pi-hole is disabled.
+.SH FILES
+.IP ~/.config/pihelper.conf
+The default configuration file.
+.SH EXAMPLES
+Print the status of the Pi-hole:
+.PP
+.RS
+pihelper
+.RE
+.PP
+Enable the Pi-hole:
+.PP
+.RS
+pihelper -e
+.RE
+.PP
+Disable the Pi-hole permanently:
+.PP
+.RS
+pihelper -d
+.RE
+.PP
+Disable the Pi-hole for 5 minutes:
+.PP
+.RS
+pihelper -d300
+.SH AUTHOR
+Originally written by William Brawner <me@wbrawner.com>
+.SH COPYRIGHT
+Copyright (c) 2019-2020 William Brawner
+.PP
+PiHelper is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.