Update the README documentation

Replace the HTML version README document with a MarkDown version suitable for display in GitHub

Author: julian-maughan

README.md

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+Welcome to NHibernate!
+======================
+
+[NHibernate](http://www.nhforge.org) is a mature, open source object-relational mapper for the .NET 
+framework. It is actively developed, fully featured and used in thousands of successful projects.
+
+The NHibernate community website - <http://www.nhforge.org> - has a range of resources to help you get started,
+including [wikis](http://nhforge.org/wikis), [blogs](http://nhforge.org/blogs/nhibernate) and 
+[reference documentation](http://nhforge.org/doc/nh/en/index.html).
+
+Latest Version
+--------------
+
+The quickest way to get the latest release of NHibernate is to add it to your project using 
+NuGet (<http://nuget.org/List/Packages/NHibernate>).
+
+Alternatively binaries are available from SourceForge at <http://sourceforge.net/projects/nhibernate>.
+
+You are encouraged to review the release notes (releasenotes.txt), particularly when upgrading to a 
+later version. The release notes will generally document any breaking changes.
+
+Community Forums
+----------------
+
+There are two official NHibernate community forums:
+
+* [NHibernate Users](http://groups.google.com/group/nhusers) - for NHibernate users 
+* [NHibernate Development](http://groups.google.com/group/nhibernate-development) - for NHibernate developers
+
+Bug Reports
+-----------
+
+If you find any bugs, please report them using the [JIRA bug tracker](http://nhibernate.jira.org). A
+test-case that demonstrates the issue is usually required. Instructions on providing a test-case
+can be found [here](http://nhforge.org/blogs/nhibernate/archive/2008/10/04/the-best-way-to-solve-nhibernate-bugs-submit-good-unit-test.aspx).
+  
+Licenses
+--------
+
+This software is distributed under the terms of the Free Software 
+Foundation [Lesser GNU Public License (LGPL), version 2.1](<http://www.gnu.org/licenses/lgpl-2.1-standalone.html>) (see lgpl.txt).
+
+Credits
+-------
+
+Thanks go to the following projects, individuals and organisations for being part of the NHibernate story:
+
+* LinFu - thanks to Philip Laureano for donating his LinFu proxy implementation (<http://code.google.com/p/linfu/>).
+* Iesi.Collections - includes source code from an article written by Jason Smith, [Add Support for "Set" Collections to .NET](http://www.codeproject.com/KB/recipes/sets.aspx)
+* NUnit (<http://www.nunit.org>)
+* Nant (<http://nant.sourceforge.net/>)
+* TeamCity - hosted by Codebetter for Continuous Integration
+* GitHub and SourceForge for source code hosting
+* Atlassian for Jira hosting
+* log4net - developed by the Apache Software Foundation (<http://www.apache.org>).
+* JetBrains - for donating ReSharper licences for NHibernate developers