Getting quiz state endpoint

[S-Maciejewski]

An endpoint that returns:

• current metrics
• current countries options
• current score Should maintain session data on server (or a browser cookie would be a better solution?)

[S-Maciejewski]

Client expects

export interface GameState {
    score: number
    quizData: QuizData
}

export interface QuizData {
    indicators: IndicatorData[]
    countries: string[]
}

export interface IndicatorData {
    series: [number, number][]
    indicatorName: string
}