instructions for use of containers and parcel.js

CONTRIBUTING.md

@@ -8,3 +8,20 @@ code base functions are utilized) and later make merges with
 the main code easier.
 
 In any case, don't hesitate to open issue to ask questions and discuss ideas and suggestions.
+
+## Local development
+
+Backend and FE in container (Linux with Podman installed)
+
+```bash
+source build_containers.sh
+source deploy.sh
+```
+
+Running development server of front end (requires `npm`)
+
+```bash
+cd caroline/html
+npm install
+npx parcel index.html
+```