update filess

z1/README.md

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-start of the readme
+Welcome in my Readme file!
+
+1. Deployment requirements: 
+- Have a Linux OS
+- Have Docker and Docker Compose
+
+2. Application overview :
+This is an app using Flash and it's connected to a PostgreSQL database.
+The only thing that the app do is show a little text in a web page.
+
+3. Virtual networks and named volumes used 
+- Virtual network: my app uses a Docker network who makes the communication between web app and the database possible.
+- Named volume: I have one persistent volume "postgres_data" for store the database files so I have the data when the cainer is restarted.
+
+4. Container configuration :
+It uses 2 containers:
+- The web container (Flash): the exposes port is 5000, and I use my_app_network as network. 
+- The database container (PostgreSQL): there are 3 environment variables (user, password and database); a persistent volume (postgres_data) and it uses my_app_network as network.
+
+5. Instructions for the deployment :
+-First, need
+
+6. Instructions for accessing the app :