chore: add vscode workspace settings to gitignore (#11108)

There are workspace settings for vscode plugins that make contributing to ohmyzsh easier. However, these would be noisy for users, especially for those that don't use vscode.

.gitignore

@@ -6,3 +6,6 @@ cache/
 log/
 *.swp
 .DS_Store
+
+# editor configs
+.vscode