Update readme

compendium-frontend/README.md

@@ -28,3 +28,14 @@ bun run build
 This will build the new bundle and deploy it to
 `compendium_v2/static/*`.  This should be committed to the repository.
 
+# Linting/Formatting
+
+For the Flask app, use pep8 (autopep8 in vscode) with a max line length of 120.
+The frontend (compendium-frontend) uses eslint for linting checks, and some formatting rules are enforced.
+
+The build of the frontend is gated by a linting check, to fix anything auto-fixable, use:
+```bash
+bun run lint:fix
+```
+
+