Add description for Sakila data

Author: datacharmer

sakila/README.md

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+
+This sample database is derived from the Sakila-spatial db, available from 
+[the MySQL docs](https://dev.mysql.com/doc/index-other.html).
+
+The changes applied here are quite simple:
+
+* The FULLTEXT index in InnoDB is added conditionally for MySQL 5.6+
+* The GEOMETRY column and SPATIAL index are added conditionally for MySQL 5.7+
+