Change readme to md format

README.md

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+The .sql is a plain text SQL backup
+that should be restored with psql.
+
+It consists of the census and staging schemas. As well as some other minor tables
+Some of these are built as part of exercises in the book.  
+
+To restore:
+```sql
+CREATE DATABASE postgresql_book;
+\connect postgresql_book
+\i postgresql_book.sql
+```
+
+IMDB movies list comes from ftp://ftp.fu-berlin.de/pub/misc/movies/database/movies.list.gz
+refer to copyright details in http://www.imdb.com/interfaces
+Information courtesy of
+IMDb
+(http://www.imdb.com).
+Used with permission.