docs: Add man pages

This patch adds man pages for chasquid's main commands and
configuration. They are generated using pod2man (commonly used for this,
and included with perl in most distributions).

The generated man pages are included to avoid introducing a dependency
for such simple task, similar to how we handle protocol buffer generated
files.

docs/man/mda-lmtp.1

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+.\" Automatically generated by Pod::Man 4.09 (Pod::Simple 3.35)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
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+.nf
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+..
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+..
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+.tr \(*W-
+.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
+.ie n \{\
+.    ds -- \(*W-
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+.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
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+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
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+..
+.if !\nF .nr F 0
+.if \nF>0 \{\
+.    de IX
+.    tm Index:\\$1\t\\n%\t"\\$2"
+..
+.    if !\nF==2 \{\
+.        nr % 0
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+.\}
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+.    ds #H 0
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+.if t \{\
+.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
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+.\}
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+.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
+.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
+.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
+.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
+.\}
+.    \" troff and (daisy-wheel) nroff accents
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+\{\
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+.\}
+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "mda-lmtp 1"
+.TH mda-lmtp 1 "2018-04-02" "" ""
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+mda\-lmtp \- MDA that uses LMTP to do the mail delivery
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+mda-lmtp
+[\fB\-addr_network\fR \fInet\fR]
+\&\fB\-addr\fR \fIaddr\fR
+\&\fB\-d\fR \fIrecipient\fR
+\&\fB\-f\fR \fIfrom\fR
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+mda-lmtp is a very basic \s-1MDA\s0 that uses \s-1LMTP\s0 to do the mail delivery.
+.PP
+It takes command line arguments similar to maildrop or procmail, reads an
+email via standard input, and sends it over the given \s-1LMTP\s0 server.  Supports
+connecting to \s-1LMTP\s0 servers over \s-1UNIX\s0 sockets and \s-1TCP.\s0
+.PP
+It can be used when your mail server does not support \s-1LMTP\s0 directly.
+.SH "EXAMPLE"
+.IX Header "EXAMPLE"
+\&\fBmda-lmtp\fR \fI\-\-addr=localhost:1234\fR \fI\-f juan@casa\fR \fI\-d jose\fR < email
+.SH "OPTIONS"
+.IX Header "OPTIONS"
+.IP "\fB\-addr\fR \fIaddress\fR" 8
+.IX Item "-addr address"
+\&\s-1LMTP\s0 server address to connect to.
+.IP "\fB\-addr_network\fR \fInetwork\fR" 8
+.IX Item "-addr_network network"
+Network of the \s-1LMTP\s0 address (e.g. \fIunix\fR or \fItcp\fR). If not present, it will
+be autodetected from the address itself.
+.IP "\fB\-d\fR \fIrecipient\fR" 8
+.IX Item "-d recipient"
+Recipient.
+.IP "\fB\-f\fR \fIfrom\fR" 8
+.IX Item "-f from"
+Whom the message is from.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+.IP "\fB0\fR" 8
+.IX Item "0"
+success
+.IP "\fB75\fR" 8
+.IX Item "75"
+temporary failure
+.IP "\fIother\fR" 8
+.IX Item "other"
+permanent failures (usually indicate misconfiguration)
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIchasquid\fR\|(1)