Add initial README, LICENSE and CONTRIBUTING files

These will need to be updated as we go, but it gives us a starting point.

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from #1)

Author: mattcaswell

CONTRIBUTING

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+To report a problem with this guide please open an issue on GitHub.
+
+To submit a minor patch to this guide please open a pull request on GitHub. Note
+that we do not accept merge commits; You will be asked to remove them before a
+patch is considered acceptable.
+
+To contribute significant content (e.g. a new chapter) you should also open a
+pull request on GitHub. However please discuss the outline of your chapter
+content on the openssl-dev email list before starting work (see
+https://mta.openssl.org for details).

LICENSE

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+The License is TBD. It will most likely be one of
+
+Apache v2 License
+CC-BY 4.0
+The OpenSSL License
+
+Please only contribute to this project if you are willing for your content to be
+licensed using one of the above or a similar Open Source license.

README

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+Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+
+Overview
+========
+
+The OpenSSL Guide is an attempt to create better documentation for the OpenSSL
+Toolkit. Until now the following types of documentation exist:
+
+1) Man pages
+2) Wiki
+
+The man pages are a reference guide and useful for looking up the specific usage
+of a particular command or function. The wiki is a an unreviewed community
+resource which may contain content on a wide range of subjects. Typically this
+content is relatively short and focussed on a particular subject area. The wiki
+is intended to have a relatively low barrier of entry to encourage community
+collaboration.
+
+This book is intended to fill a "gap" in this documentation, i.e. to provide a
+definitive, trusted source of introductory and "guide" style material that will
+enable a reader who is unfamiliar with OpenSSL to learn more about it. It will
+contain content that should enable the reader to get to a level of familiarity
+with OpenSSL that they can then use the other documentation sources (such as the
+man pages) to find detailed information as required.
+
+NOTE: This is a very initial draft and there is no content in the guide yet!
+
+Building the OpenSSL Guide
+==========================
+
+The following prerequisites are needed in order to build the guide:
+
+- TeX Live
+- gcc
+- make
+
+Assuming you have all of the above installed on your system, then creating the
+guide is simply a matter of typing "make" from the command line:
+
+ $ make
+
+ The output should be "openssl-book.pdf".