kernel/docs: Add timer(9) manpage

Signed-off-by: sigsegv7 <ian@vegaa.systems>

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+.\" Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright notice,
+.\"    this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of VegaOS nor the names of its
+.\"    contributors may be used to endorse or promote products derived from
+.\"    this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+
+.Dd October 6, 2023
+.Dt TIMER 9
+.Os
+.Sh NAME
+.Nm timer - vega timer abstraction
+.Sh SYNOPSIS
+.In sys/timer.h
+.Sh DESCRIPTION
+The timer registry abstraction allows timers on the machine
+to be registered as a generic timer type allowing other parts
+of the kernel to request a timer of that type e.g scheduler reserved
+timers (TIMER_SCHED). All timers within the system are represented via
+a timer descriptor which is simply the
+.Ft timer
+struct.
+
+The timer struct pointer fields are optional and must
+be
+.Ft NULL
+if unused. Therefore it is the requesting kernel module's responsibility to verify
+a field is not unused before using it for obvious reasons.
+
+
+However, it is highly recommended to set the
+.Ft name
+field. This field on an HPET timer could be, for example:
+.Ft HIGH_PRECISION_EVENT_TIMER
+
+.Sh AUTHORS
+.An Ian Moffett Aq Mt ian@vegaa.systems