doc: intro deploy and clone + venv

Author: jeremyfix

README.md

@@ -36,4 +36,54 @@ will complain about your proposed feature.
 
 ## Deployment
 
+We deploy two websites. One for production and one for development. In both
+cases, the process is the same, the only difference being the branch being used
+to run the server.
+
+Deploying a website involves : 
+
+- cloning the repository and setting up the virtual environment,
+- configuring nginx with a base setup listening on port 80 and then adding https
+  support with a SSL certificate
+- wrapping the start/stop of the taipy server with a systemd service
+
+### Cloning and virtual environment
+
+First clone the repository :
+
+```
+cd /opt/d4g
+git clone https://github.com/dataforgoodfr/12_taxobservatory_dataviz.git
+cd 12_taxobservatory_dataviz
+```
+
+If you want to deploy the development website, you must checkout the `dev`
+branch. If you want to deploy the production website, you must checkout the
+`main` branch. 
+
+```
+git checkout dev   # For development website
+git checkout main  # For production website
+```
+
+You can then create a local virtual environment, install poetry as well as the
+project dependencies :
+```
+. ./d4g-utils/install_poetry.sh
+```
+
+We need some extra packages for the deployment :
+
+```
+source .venv/bin/activate
+pip install uwsgi gevent
+```
+
+### Nginx setup
+
 TBD
+
+### Systemd service file
+
+TBD
+