feat: DTOs and interfaces

Services/Interfaces/IPlayerService.cs

@@ -0,0 +1,14 @@
+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IPlayerService
+{
+    Task<Player?> GetPlayerByUserIdAsync(string userId);
+    Task<Player> CreatePlayerAsync(string userId, string username);
+    Task<Player> UpdatePlayerRankAsync(Guid playerId, Guid newRankId);
+    Task<Player> AddPlayerExperienceAsync(Guid playerId, int experience);
+    Task<Player> AddPlayerManaAsync(Guid playerId, int mana);
+    Task<IEnumerable<Player>> GetTopPlayersAsync(int topCount, TimeSpan timeFrame);
+    Task<Player> GetPlayerWithProgressAsync(Guid playerId);
+}