Add enum for Selection method

src/Managing.Infrastructure.Database/MongoDb/Collections/GeneticRequestDto.cs

@@ -19,7 +19,7 @@ namespace Managing.Infrastructure.Databases.MongoDb.Collections
         public int PopulationSize { get; set; }
         public int Generations { get; set; }
         public double MutationRate { get; set; }
-        public string SelectionMethod { get; set; }
+        public GeneticSelectionMethod SelectionMethod { get; set; }
         public int ElitismPercentage { get; set; }
         public double MaxTakeProfit { get; set; }
         public List<IndicatorType> EligibleIndicators { get; set; } = new();