chore: add .gitignore for OS and editor generated files

Author: shijiashuai

.gitignore

@@ -0,0 +1,21 @@
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+desktop.ini
+
+# Editor files
+*.swp
+*.swo
+*~
+.vscode/
+.idea/
+*.sublime-project
+*.sublime-workspace
+
+# Node (if used for tooling)
+node_modules/