Add .gitignore for .DS_Store and local notes vault

Keep macOS Finder metadata and the local Claude notes directory out of the tracked repository.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,5 @@
+# macOS
+.DS_Store
+
+# Local Claude notes vault (not part of the published repo)
+AI-Papers-of-the-Week-notes/