placed sql into the data folder as core/module describes

data/sql/README.md

@@ -0,0 +1,32 @@
+# NEW MODULE - SQL BEST PRACTICES
+
+## Create a new table
+
+**Example:**
+```
+CREATE TABLE IF NOT EXISTS `table`(
+  `id` int(11) unsigned NOT NULL,
+  `column` smallint(6) unsigned,
+  `active` BOOLEAN DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+```
+
+**Boolean datatype in mysql:**
+Use `TinyInt(1)` or `Boolean` (this is the same thing)
+
+`bit(1)` can also work, but it may require a syntax like `b'(0)` and `b'(1)` when inserting (not sure).
+
+If there are multiple booleans in the same table, bit(1) is better, otherwise it's the same result.
+
+
+## Rules
+
+- Use `InnoDB` as engine for dynamic tables (most likely in the `auth` and `characters` databases).
+- Use `MyISAM` for **read-only** tables (in `world` database), but if you're not sure, just use innoDB.
+- Use `utf8` as charset.
+
+
+## Resources
+
+https://www.w3schools.com/sql/sql_datatypes.asp