Add project files.

src/modules/Elsa.Alterations/Constants/AlterationFaultCategories.cs

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+namespace Elsa.Alterations;
+
+public static class AlterationFaultCategories
+{
+    public const string Alteration = "Alteration";
+}

src/modules/Elsa.Alterations/Constants/AlterationFaultCodes.cs

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+namespace Elsa.Alterations;
+
+public static class AlterationFaultCodes
+{
+    public const string PlanNotFound = "PlanNotFound";
+}