Added Human parts

Parts/PartNotAttachableException.cs

@@ -0,0 +1,4 @@
+namespace WaifuCellar.Parts;
+
+public class PartNotAttachableException(Part errorPart, Type destPart, string message = "") : Exception(
+    $"Part {System.Reflection.Assembly.GetAssembly(errorPart.GetType())?.GetName().Name} cannot be attached to {destPart.Name}.\n{message}");