added commandInterface text description for FetchConstraints

Src/CommandLine/CommandInterface.cs

@@ -65,6 +65,7 @@ private enum WatchLevelKind { Off, On, Prompt };
         private const string WatchMsg = "Use: watch [off | on | prompt] to control watch behavior";
         private const string CoreMsg = "Prints reduced rule set for domains / transforms. Use: core module_name";
         private const string DowngradeMsg = "Attempts to downgrade a (partial) model to Formula V1. Use: downgrade module_name";
+        private const string FetchConstraints = "Attemps to fetch the constraints in the domain"
 
         private SpinLock cmdLock = new SpinLock();
         private bool isCmdLocked = false;