Move webapi to sub folder

GerbilManagerWebAPI/Dtos/CreateLitterDto.cs

@@ -0,0 +1,11 @@
+namespace GerbilManager.Dtos
+{
+        public record CreateLitterDto
+    {
+        public string Name { get; init; }
+        public DateTime Date { get; init; }
+        public int Strength { get; init; }
+        public Guid Father { get; init; }
+        public Guid Mother { get; init; }
+    }
+}