Squashed 'third_party/boostorg/assert/' content from commit 4bd93cd

Change-Id: I7f6cb35310fc8236af3a608fd27ff62c3817fdb9
git-subtree-dir: third_party/boostorg/assert
git-subtree-split: 4bd93cd4141b5d48e090495551e3bce931321f62
diff --git a/doc/index.adoc b/doc/index.adoc
new file mode 100644
index 0000000..6e5026e
--- /dev/null
+++ b/doc/index.adoc
@@ -0,0 +1,35 @@
+////
+Copyright 2017 Peter Dimov
+
+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
+////
+
+# Boost.Assert
+Peter Dimov
+:toc: left
+:idprefix:
+:docinfo: private-footer
+
+The Boost.Assert library provides several configurable diagnostic macros
+similar in behavior and purpose to the standard macro `assert` from `<cassert>`.
+
+:leveloffset: +1
+
+include::assert.adoc[]
+
+include::current_function.adoc[]
+
+:leveloffset: -1
+
+[appendix]
+## Copyright and License
+
+This documentation is
+
+* Copyright 2002, 2007, 2014, 2017 Peter Dimov
+* Copyright 2011 Beman Dawes
+* Copyright 2015 Ion Gaztañaga
+* Distributed under the http://www.boost.org/LICENSE_1_0.txt[Boost Software License, Version 1.0].