Create an annotation microservice in the project domain

[DylanBulmer]

models:

interface Annotation {
  "createdAt": Date;
  "updatedAt": Date;
  "completedAt": Date;
  "context": string; // question id or other identifying text
  "response": string; // the input from the user
  "createdBy": ObjectId; // user collection ref
  "reviewedBy": ObjectId | undefined; // user collection ref
  "sample": ObjectId; // sample collection ref
  "status": "COMPLETE" | "APPROVED" | "REJECTED";
}