chore: add SQL reference object workshop to main repo

[jdwilkin4]

We are adding the entire relational database projects to the frontend cert. We are adding everything as is.

For this issue, add the Build an SQL Reference Object project to the main repo.

https://www.freecodecamp.org/learn/relational-database/learn-git-by-building-an-sql-reference-object/build-an-sql-reference-object

make sure to keep the same ids