Add Gun 2.0-pre documentation

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+[[introduction]]
+== Introduction
+
+Gun is an HTTP client for Erlang/OTP.
+
+Gun supports the HTTP/2, HTTP/1.1 and Websocket protocols.
+
+=== Prerequisites
+
+Knowledge of Erlang, but also of the HTTP/1.1, HTTP/2 and Websocket
+protocols is required in order to read this guide.
+
+=== Supported platforms
+
+Gun is tested and supported on Linux, FreeBSD, Windows and OSX.
+
+Gun is developed for Erlang/OTP 20.0 and newer.
+
+Note that Gun will not work on the Windows build of Erlang/OTP 20.3
+due to a bug in Erlang/OTP's stdlib application. The ticket number
+for this bug is OTP-13995 and it was fixed in the patch release
+OTP-20.3.2. Replacing the `gen_statem.beam` file on an 20.3
+installation is enough to fix the issue.
+
+=== License
+
+Gun uses the ISC License.
+
+----
+Copyright (c) 2013-2019, Loïc Hoguin <[email protected]>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+----
+
+=== Versioning
+
+Gun uses http://semver.org/[Semantic Versioning 2.0.0].
+
+=== Conventions
+
+In the HTTP protocol, the method name is case sensitive. All standard
+method names are uppercase.
+
+Header names are case insensitive. Gun converts all the header names
+to lowercase, including request headers provided by your application.