doc: Add "What's the demo for ?" section to the documentation

doc/installation.md

@@ -0,0 +1,23 @@
+Installation
+============
+
+To run the stack:
+
+```shell
+docker compose -f docker\docker-compose-prod.yaml -p event-demo up -d
+```
+
+Api url:
+- [Backend API](http://api.traefik.me/)
+- [Frontend web site](http://app.traefik.me/) (WIP)
+
+Exposed url on test env:
+- [PostgreSql](http://localhost:5432/)
+- [Redis](http://localhost:6379/)
+- [RabbitMQ](http://localhost:15672/)
+
+Admin service URL:
+- [Træfik dashboard](http://traefik.traefik.me/)
+- [Redis insight](http://insight.redis.traefik.me/)
+- [pgAdmin](http://pgadmin.postgresql.traefik.me/)
+- [RabbitMQ management](http://management.rabbitmq.traefik.me/)