Implement unified API controller pattern

EstusShots.Shared/Interfaces/IApiParameter.cs

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+namespace EstusShots.Shared.Interfaces
+{
+    /// <summary>
+    /// Marks a class that can be used as a parameter for API requests
+    /// </summary>
+    public interface IApiParameter { }
+    
+    /// <summary>
+    /// Marks a class as response type that is returned from API requests
+    /// </summary>
+    public interface IApiResponse { }
+}

EstusShots.Shared/Interfaces/ISeasonsController.cs

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+using System.Threading.Tasks;
+using EstusShots.Shared.Models;
+using EstusShots.Shared.Models.Parameters;
+
+namespace EstusShots.Shared.Interfaces
+{
+    /// <summary>
+    /// Access many seasons with one request
+    /// </summary>
+    public interface ISeasonsController
+    {
+        /// <summary>
+        /// Get a list of all seasons in the system
+        /// </summary>
+        /// <param name="parameter"></param>
+        /// <returns></returns>
+        Task<ApiResponse<GetSeasonsResponse>> GetSeasons(GetSeasonsParameter parameter);
+
+        Task<ApiResponse<GetSeasonResponse>> GetSeason(GetSeasonParameter parameter);
+
+        Task<ApiResponse<SaveSeasonResponse>> SaveSeason(SaveSeasonParameter parameter);
+    }
+}