Add ReadMe for MySQL installation

Author: mdmintz

help_docs/mysql_installation.md

@@ -0,0 +1,18 @@
+### MySQL Installation Instructions
+
+
+#### [MySQL](http://www.mysql.com/) (OPTIONAL)
+
+(NOTE: If you're using this test framework from a local development machine and don't plan on writing to a MySQL DB from your local test runs, you can skip this step.)
+
+Mac:
+
+```bash
+brew install MySQL
+```
+
+Windows: [Download MySQL here](http://dev.mysql.com/downloads/windows/)
+
+That installs the MySQL library so that you can use db commands in your code. To make that useful, you'll want to have a MySQL DB that you can connect to. You'll also want to use the testcaserepository.sql file from the seleniumbase/core folder to add the necessary tables.
+
+If you want a visual tool to help make your MySQL life easier, [try MySQL Workbench](http://dev.mysql.com/downloads/workbench/).