Initial commit: Add project files

src/KArtSell.Modules.SignalEngine/Domain/ISellPolicy.cs

@@ -0,0 +1,8 @@
+namespace KArtSell.Modules.SignalEngine.Domain;
+
+public interface ISellPolicy
+{
+    int Priority { get; }
+    string PolicyId { get; }
+    SellPolicyResult Evaluate(SellDecisionInput input);
+}