4565: add development documentation

Author: Sine Jespersen

README.md

@@ -1,5 +1,22 @@
 # OS2Display
 
+## Development
+
+```bash
+docker compose pull                      
+docker compose up --detach
+docker compose exec phpfpm composer install
+docker compose run --rm node npm install
+
+# Run migrations
+docker compose exec phpfpm bin/console doctrine:migrations:migrate
+
+# Load fixtures (Optional)
+docker compose exec phpfpm bin/console hautelook:fixtures:load --no-interaction
+```
+
+The fixtures have an admin user: <[email protected]> with the password: apassword The fixtures have an editor user: <[email protected]> with the password: apassword The fixtures have the image-text template, and two screen layouts: full screen and "two boxes".
+
 ## Description
 
 TODO