Adding useful user documentation.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

CONTRIBUTING.md

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+This repository doesn't accept external contributions, you probably want to
+[contribute to Project X-Ray](https://github.com/SymbiFlow/prjxray/blob/master/CONTRIBUTING.md)
+and then request
+[Tim 'mithro' Ansell](mailto:me@mith.ro) update the database.
+

COPYING

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+Copyright (C) 2017  The Project X-Ray Authors. All rights reserved.
+
+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.

README.md

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+# Project X-Ray - Xilinx Series 7 Bitstream Documentation
+
+This repo contains the bitstream documentation database for Xilinx Series 7
+devices.
+
+[HTML version of the Xilinx Series 7 BitStream is avaliable on https://symbiflow.github.io/prjxray-db](https://symbiflow.github.io/prjxray-db).
+
+This documentation was generated using the
+[Project X-Ray tools](https://github.com/SymbiFlow/prjxray).
+
+Due to the long time taken to create this database yourself, a prebuilt version
+is currently being provided by Tim 'mithro' Ansell <me@mith.ro>. The database
+is intended to kept in sync with the current prjxray output, but due to the
+manual nature required to create it, it may sometimes lag behind
+what you could create yourself using those tools.
+
+Please try contacting [mailto:me@mith.ro](Tim) if you believe the database is
+more than a week out of date.
+
+# Contributions
+
+As this repo is created from the prjxray output it doesn't accept external
+contributions.  You are encourage to generate and maintain your own versions of
+this documentation if your needs are not being met by this repository.
+
+The
+[htmlgen.py](https://github.com/SymbiFlow/prjxray/blob/master/htmlgen/htmlgen.py)
+is kept in sync with the version in
+[Project X-Ray](https://github.com/SymbiFlow/prjxray), please contribute all changes to
+that file and then request Tim to rebuild the HTML output.
+
+# License
+
+These files are released under the very permissive
+[ISC License, see the COPYING file for the full text](COPYING).
+