add license, move folders

app/scripts/sandbox/sandbox_executable.gd

@@ -0,0 +1,33 @@
+extends Resource
+class_name SandboxExecutable
+
+@export var linux: String
+@export var linux_debug: String
+
+@export var windows: String
+@export var windows_debug: String
+
+var path: String :
+	get = get_executable_path
+
+
+func get_executable_path() -> String:
+	var executable_dir = OS.get_executable_path().get_base_dir() + "/"
+	return executable_dir + get_filename()
+
+
+func get_filename() -> String:
+	var is_debug = Platform.is_debug()
+	
+	match Platform.get_platform():
+		Platform.WINDOWS:
+			return windows_debug if is_debug else windows
+		Platform.LINUX_BSD:
+			return linux_debug if is_debug else linux
+		_:
+			assert(false, "Platform is not supported")
+			return ""
+
+
+func exists() -> bool:
+	return FileAccess.file_exists(path)