chore: add GUT test framework

addons/gut/.gitignore

@@ -0,0 +1,35 @@
+# Godot 4+ specific ignores
+.godot/
+logs/
+
+# Godot-specific ignores
+.import/
+export.cfg
+export_presets.cfg
+addons/*
+!addons/gut
+
+# Imported translations (automatically generated from CSV files)
+*.translation
+
+# Mono-specific ignores
+.mono/
+data_*/
+mono_crash.*.json
+
+# System/tool-specific ignores
+.directory
+*~
+.DS_Store
+exported_tests.cfg
+.vscode/
+
+# GUT-specific ignores
+.gut_editor_config.json
+.gut_editor_shortcuts.cfg
+
+documentation/docs/_build
+
+
+documentation/class_ref_xml
+documentation/class_ref/__pycache__