add readme file, to replace old home page

which was at https://sqlalchemy-sa.edbob.org

README.md

@@ -0,0 +1,43 @@
+
+# SQLBase7-SA
+
+SQLBase7-SA is a SQLAlchemy driver/dialect for the Centura SQLBase
+database, specifically version 7.5.1.
+
+## About the Project
+
+From what I can tell, SQLBase is still an actively-developed database,
+but it is no longer owned by Centura (see
+[here](http://en.wikipedia.org/wiki/Gupta_Technologies)).  Also, the
+current version (according to [this
+page](http://www.unify.com/Products/Data_Management/SQLBase/), as of
+25 Apr 2010) is 11.5, so I have no idea how useful this project will
+be for versions of SQLBase more recent than 7.5.1.
+
+This project exists only for the sake of providing read-only access to
+legacy data, specifically that used by the
+[CAM32](http://www.camcommerce.com/products/CAM32.aspx) Point of Sale
+software.  It's possible that it could allow writing data, etc., but I
+personally won't be adding any such features unless/until the need
+arises.
+
+I don't expect there to be much of anyone using SQLBase 7.5.1 at this
+point (besides perhaps other CAM32 users), but if you do happen to
+need additional functionality from this project or just have questions
+or comments, feel free to drop me a line at lance@edbob.org.
+
+## Downloads
+
+The code is released under the [GNU General Public
+License](http://www.gnu.org/licenses/gpl.html), version 3.
+
+It is available at [PyPI](http://pypi.python.org/pypi/SQLBase7-SA), so
+the easiest way to get the package is with the command:
+
+      # pip install SQLBase7-SA
+
+Again, this project is extremely specific to my needs, so I'm only
+building eggs for Python 2.5 and 2.6 at this point.  If you happen to
+need something else then please contact me.
+
+Copyright © 2010 Lance Edgar <lance@edbob.org>