Add build script

Assets/Editor/BuildScript.cs

@@ -0,0 +1,14 @@
+using UnityEditor;
+
+public class BuildScript
+{
+    public static void BuildWindows()
+    {
+        BuildPipeline.BuildPlayer(
+            new[] { "Assets/Scenes/SampleScene.unity" },
+            "Builds/Windows/botchain.exe",
+            BuildTarget.StandaloneWindows64,
+            BuildOptions.None
+        );
+    }
+}