Qt: Add barebones manpage (no command line options yet)

doc/mgba-qt.6

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+.\" Copyright (c) 2015 Anthony J. Bentley <anthony@anjbe.name>
+.\"
+.\" This Source Code Form is subject to the terms of the Mozilla Public
+.\" License, v. 2.0. If a copy of the MPL was not distributed with this
+.\" file, you can obtain one at https://mozilla.org/MPL/2.0/.
+.Dd July 29, 2015
+.Dt MGBA-QT 6
+.Os
+.Sh NAME
+.Nm mgba-qt
+.Nd Game Boy Advance emulator
+.Sh SYNOPSIS
+.Nm mgba-qt
+.Ar file
+.Sh DESCRIPTION
+.Nm
+is a Game Boy Advance emulator.
+.Sh CONTROLS
+The default controls are as follows:
+.Bl -hang -width "Frame advance" -compact
+.It A
+.Cm x
+.It B
+.Cm z
+.It L
+.Cm a
+.It R
+.Cm s
+.It Start
+.Aq Cm Enter
+.It Select
+.Aq Cm Backspace
+.It Load state
+.Cm F1 Ns \(en Ns Cm F9
+.It Save state
+.Ao Cm Shift Ac Ns \(hy Ns Cm F1 Ns \(en Ns Cm F9
+.It Frame advance
+.Ao Cm Ctrl Ac Ns \(hy Ns Cm n
+.El
+.Sh AUTHORS
+.An Jeffrey Pfau Aq Mt jeffrey@endrift.com
+.Sh HOMEPAGE
+.Bl -bullet
+.It
+.Lk https://mgba.io/ "mGBA homepage"
+.It
+.Lk https://github.com/mgba-emu/mgba "Development repository"
+.It
+.Lk https://github.com/mgba-emu/mgba/issues "Bug tracker"
+.It
+.Lk https://forums.mgba.io/ "Message board"
+.El