Add GetPlayers() Method

Stratis.Guru/Models/IParticipations.cs

+using System.Collections.Generic;
+
 namespace Stratis.Guru.Models
 {
     public interface IParticipation
     {
         void StoreParticipation(string ticket, string nickname, string address);
+        List<string> GetPlayers(string draw);
     }
 }
\ No newline at end of file

Stratis.Guru/Models/Participations.cs

 using System;
+using System.Collections.Generic;
+using System.Linq;
+using MongoDB.Driver;
 
 namespace Stratis.Guru.Models
 {
@@ -13,6 +16,8 @@ namespace Stratis.Guru.Models
             _draws = draws;
         }
 
+        public List<string> GetPlayers(string draw) => _databaseContext.Participations.Find(x => x.Draw.Equals(draw)).ToList().Select(x => x.Nickname).Distinct().ToList();
+
         public void StoreParticipation(string ticket, string nickname, string address)
         {
             _databaseContext.Participations.InsertOne(new Participation