Change log, license and readme files included

CHANGELOG

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+0.9.0
+	Released December 4 2009
+	Initial release of the PostgreSQL module

LICENSE

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+* Copyright (c) 2009, Silverstripe Ltd.
+* All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*     * Redistributions of source code must retain the above copyright
+*       notice, this list of conditions and the following disclaimer.
+*     * Redistributions in binary form must reproduce the above copyright
+*       notice, this list of conditions and the following disclaimer in the
+*       documentation and/or other materials provided with the distribution.
+*     * Neither the name of the <organization> nor the
+*       names of its contributors may be used to endorse or promote products
+*       derived from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY Silverstripe Ltd. ``AS IS'' AND ANY
+* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+* DISCLAIMED. IN NO EVENT SHALL Silverstripe Ltd. BE LIABLE FOR ANY
+* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README

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+###############################################
+PostgreSQL Module
+###############################################
+
+Maintainer Contact
+-----------------------------------------------
+Geoff Munn (Nickname: gmunn)
+<geoff (at) silverstripe (dot) com>
+
+Requirements
+-----------------------------------------------
+- PostgreSQL 8.3.x or greater must be installed
+- PostgreSQL <8.3.0 may work if T-Search is manually installed
+- Known to work on OS X Leopard, Windows Server 2008 R2 and probably Linux
+
+Documentation
+-----------------------------------------------
+http://doc.silverstripe.org/doku.php?id=postgres
+
+Installation Instructions
+-----------------------------------------------
+
+Move the 'postgres' folder to the root level of the project.
+You'll need to create a database with the desired name manually. 
+Run dev/build and you should be set.
+
+Usage Overview
+-----------------------------------------------
+
+See the documentation link for examples of PostgreSQL-specific functionality.
+
+Known issues:
+-----------------------------------------------
+
+When you're setting this up for the first time, you will need to manually create the database 'SS_project' or whatever it's called.  
+I haven't implemented the automatic database creation logic yet.
+
+All column and table names must be double-quoted.  PostgreSQL automatically lower-cases columns, and your queries will fail if you don't.
+
+Ts_vector columns are not automatically detected by the built-in search filters.  
+That means if you're doing a search through the CMS on a ModelAdmin object, it will use LIKE queries which are very slow.  
+If you're writing your own front-end search system, you can specify the columns to use for search purposes, and you get the full benefits of T-Search.
+
+Most other modules probably don't work.  There are many instances of MySQL-compatible backticks '`' littering existing modules, 
+and these need to be changed to double-quotes.  
+There may also be instances of MySQL-specific SQL queries which will need to be made database-agnostic where possible.
+