gitignore: Add macOS files and more files from QtCreator

Author: autoantwort

.gitignore

@@ -51,6 +51,7 @@ html/
 *.cxxflags
 *.files
 *.includes
+CMakeLists.txt.user
 
 #VS-Code
 .vscode
@@ -62,4 +63,7 @@ venv
 
 #Bazel
 bazel-*
-MODULE.bazel.lock
+MODULE.bazel.lock
+
+# macOS Files
+.DS_Store