Rename README to README.md and make it proper Markdown.

README.md

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+Exception/Class/DBI version 1.01
+================================
+
+This module offers a set of DBI-specific exception classes. They inherit from
+Exception::Class::Base, the base class for all exception objects created by
+the [Exception::Class](http://search.cpan.org/perldoc?Exception::Class) module
+from the CPAN. Exception::Class::DBI itself offers a single class method,
+`handler()`, that returns a code reference appropriate for passing the
+[DBI](http://search.cpan.org/perldoc?DBI) `HandleError` attribute.
+
+The exception classes created by Exception::Class::DBI are designed to be
+thrown in certain DBI contexts; the code reference returned by `handler()` and
+passed to the DBI `HandleError attribute determines the context, assembles the
+necessary metadata, and throws the apopropriate exception.
+
+Each of the Exception::Class::DBI classes offers a set of object accessor
+methods in addition to those provided by Exception::Class::Base. These can be
+used to output detailed output in the event of an exception.
+
+Installation
+------------
+
+To install this module, type the following:
+
+    perl Build.PL
+    ./Build
+    ./Build test
+    ./Build install
+
+Or, if you don't have Module::Build installed, type the following:
+
+    perl Makefile.PL
+    make
+    make test
+    make install
+
+Dependencies
+------------
+
+This module requires these other modules and libraries:
+
+* DBI 1.28 or later (1.30 or later strongly recommended).
+* Exception::Class 1.02 or later (1.05 or later strongly recommended).
+* Test::Simple 0.40 (for testing).
+
+Copyright and Licence
+---------------------
+
+Copyright (c) 2002-2011, David E. Wheeler. Some Rights Reserved.
+
+This module is free software; you can redistribute it and/or modify it under
+the same terms as Perl itself.
+