Refactor PlayerService to consume data from external endpoint or local JSON file

[nanotaboada]

JSON

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Player } from '../models/player';

@Injectable({
  providedIn: 'root'
})
export class PlayerService {

  constructor(private http: HttpClient) { }

  getPlayers(): Observable<Player[]> {
    return this.http.get<Player[]>('assets/players.json');
  }
}