docs: Updated README

README.md

@@ -47,7 +47,16 @@ pip install git+git://github.com/pyronear/pyro-risks
 
 ## Usage
 
-### datasets
+Beforehand, you will need to set a few environment variables either manually or by writing an `.env` file in the root directory of this project, like in the example below:
+
+```
+CDS_UID=my_secret_uid
+CDS_API_KEY=my_very_secret_key
+```
+Those values will allow your web server to connect to CDS [API](https://github.com/ecmwf/cdsapi), which is mandatory for your datasets access to be fully operational.
+
+
+### pyro_risks.datasets
 
 Access all pyro-risks datasets. 
 
@@ -57,6 +66,17 @@ firms = NASAFIRMS()
 noaa = NOAAWeather()
 ```
 
+### Web server
+
+To be able to expose model inference, you can run a web server using docker containers with this command:
+
+```bash
+PORT=8003 docker-compose up -d --build
+```
+
+Once completed, you will notice that you have a docker container running on the port you selected, which can process requests just like any web server.
+
+
 ## Examples
 
 You are free to merge the datasets however you want and to implement any zonal statistic you want, but some are already provided for reference. In order to use them check the example scripts options as follows: