Add new feature.

Added ILogger;
Added IGraphProcessor;

Changed return type of OnExecute method in BaseNode from void to bool;

Runtime/Contracts/IGraphProcessor.cs

@@ -1,9 +1,16 @@
-namespace Misaki.GraphView
+
+using System.Collections.ObjectModel;
+
+namespace Misaki.GraphView
 {
     public interface IGraphProcessor
     {
+        public bool IsRunning { get; }
+        
         public void UpdateComputeOrder();
         
-        public void Execute();
+        public void Execute(ReadOnlyCollection<BaseNode> nodes);
+        
+        public void Break();
     }
 }

Runtime/Contracts/ILogger.cs

@@ -0,0 +1,14 @@
+using System;
+using UnityEngine;
+
+namespace Misaki.GraphView
+{
+    public interface ILogger
+    {
+        public Action<BaseNode, string, LogType> OnLog { get; set; }
+        
+        public void LogInfo(BaseNode node, string message);
+        public void LogWarning(BaseNode node, string message);
+        public void LogError(BaseNode node, string message);
+    }
+}

Runtime/Contracts/ILogger.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: bb7bfbfa8f972214c8ba4c2213d26581