Rename IO.md to README.md

Author: asotolongo

sql/IO/IO.md sql/IO/README.mdsql/IO/IO.md renamed to sql/IO/README.md

@@ -8,4 +8,4 @@ The queries for this porpose can be used to check the information about:
 * Analyze the impact of vacuum in IO activity (high is bad,maybe >10% ?)
 * Analyze the impact of client backend in fsync activity (high is bad,maybe >10% ?)
 
-TODO: analyze , top IO consumer, top evictions
+TODO: analyze , top IO consumer, top evictions