docs: improve README and default config

env.example

@@ -1,11 +1,11 @@
 # Application configuration variables
-APP_NAME=project_name
+APP_NAME=agenda_culturel
 APP_HOST=0.0.0.0
 APP_PORT=8000
 SECRET_KEY='ur secret key'
 APP_ENV='dev' # Could be dev, prod or test
 DEBUG=True
-ALLOWED_HOSTS='app.backend.dev'
+ALLOWED_HOSTS='app.backend.dev,localhost'
 CSRF_TRUSTED_ORIGINS='https://*.backend.dev'
 CORS_ALLOWED_ORIGINS=http://app.backend.dev,http://localhost:3000