Create 08-data-methods.md

docs/reference/08-data-methods.md

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+### Data Methods
+
+Method | Options | Returns | Description
+---|---|---|---
+`setSQL(sql statement)` | `SQL string` | `this` | Change the SQL on the data table (not available with named maps)
+`error(callback)` | `callback function with a list of errors as argument` | `this` | specifies a callback function to run if there are query errors
+
+
+**Example:**
+```js
+// SQL Example to limit the data used in the Torque map.
+torqueLayer.setSQL("SELECT * FROM table LIMIT 100");