Add .godot/ folder to Godot.gitignore for Godot 4

Godot.gitignore

@@ -1,3 +1,6 @@
+# Godot 4+ specific ignores
+.godot/
+
 # Godot-specific ignores
 .import/
 export.cfg
@@ -9,3 +12,4 @@ export_presets.cfg
 # Mono-specific ignores
 .mono/
 data_*/
+mono_crash.*.json