CREATE: Service Method for Bulletin (CRN/Course Id -> Prereqs)

[DogeDevYT]

General Endpoint Requirements

1. Must use Spring Web annotations and syntax
2. Must have javadocs
3. Should be made in controller file of the specified micro service
4. Should return the return of an unimplemented fictitious JPA call (make sure to comment out above what data you need with it) with an appropriate type, consider if the possible return parameter might be more than one
5. The function name should be logical given what you're retrieving

Specific Endpoint Requirements

1. Should take CRN/Course ID as a parameter, required
2. Should return the value from a function that you make the name for to implement later, something like (JPAFile.getPrereqs()) or something better
3. Should be made in the controller file of the Bulletin Micro service on the dev branch

[DogeDevYT]

merged, closing