Make user schema

[blwelsh]

Description
The first step to having user data stored in our MongoDB.

Acceptance Criteria

• create a collection called "devusers" in MongoDB
• create a file in the database folder titled userSchema.ts
• create a role enum with possible options "user" and "admin" (to represent the two current roles)
• both create an exported type called IUsers, and a mongoose schema with the following information for users:
• _id (do NOT put this in the schema, only put it in the type), email, name, role