Module models/api.models

Challenge: { _id: String; author: String; authorEdabitId: String; difficulty: Number; edabitId: String; programmingLanguage: ProgrammingLanguage; quality: Number; rawCode: String; rawInstructions: String; rawTests: String; summary: String; tags: String[]; title: String }

ChallengeApiResponse: { _id: String; author: String; author_edabit_id: String; difficulty: Number; edabit_id: String; programming_language: ProgrammingLanguage; quality: Number; raw_code: String; raw_instructions: String; raw_tests: String; summary: String; tags: String[]; title: String }