Set up seed file for database

[edmondsoun]

See Prisma docs here for options to set up a seed file: https://www.prisma.io/docs/orm/prisma-migrate/workflows/seeding

Questions:

• Do we want to use Snaplet to auto-generate data?
• If not, preference to write seed script in TypeScript/Bash?

NOTE: unless we take an approach that auto-generates a seed file based on the current Prisma schema, let's hold off actually fleshing out this script until we've settled on a working schema.