Add simple initial asciidoc template

Jamfile.v2

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+# Copyright 2023 Christian Mazakas.
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+import asciidoctor ;
+
+html boost-manual.html : doc/boost-manual.adoc ;
+
+install html_ : boost-manual.html : <location>html ;
+
+pdf boost-manual.pdf : doc/boost-manual.adoc ;
+explicit boost-manual.pdf ;
+
+install pdf_ : boost-manual.pdf : <location>pdf ;
+explicit pdf_ ;
+
+###############################################################################
+alias boostdoc ;
+explicit boostdoc ;
+alias boostrelease : html_ ;
+explicit boostrelease ;

doc/boost-manual.adoc

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+= Boost Manual
+:toc: left
+:toclevels: 3
+:idprefix:
+:docinfo: private-footer
+:source-highlighter: rouge
+:source-language: c++
+:nofooter:
+:sectlinks:
+
+:leveloffset: +1
+
+include::boost-manual/intro.adoc[]

doc/boost-manual/intro.adoc

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+[#intro]
+= Introduction
+
+:idprefix: intro_
+
+Boost is a collection of peer-reviewed and high-quality libraries that aim to
+make application development simple and straight-forward for everyone!