updated readme with explanation

Author: JayJamieson

README.md

@@ -1,2 +1,12 @@
 # multi-tenant-sql
-sql starter for building multi tenant applications
+
+SQL starters for building multi tenant applications with MySQL, PostgreSQL and SQLite.
+
+## How to use this
+
+Each database has it's own sql schema that you can copy and past directly into your favourite DB IDE and run. Beyond that, there is not much
+else that needs to be done.
+
+- [MySQL](https://raw.githubusercontent.com/JayJamieson/multi-tenant-sql/main/mysql.sql)
+- [PostgreSQL](https://raw.githubusercontent.com/JayJamieson/multi-tenant-sql/main/postgresql.sql)
+- [SQLite](https://raw.githubusercontent.com/JayJamieson/multi-tenant-sql/main/sqlite.sql)