Merge pull request #20 from FroMage/readme

Updated README

README.md

@@ -4,15 +4,37 @@ This project uses Quarkus, the Supersonic Subatomic Java Framework.
 
 If you want to learn more about Quarkus, please visit its website: https://quarkus.io/ .
 
+## Prerequisites
+
+- Install a JDK
+    - Archive: https://jdk.java.net/23/
+    - Brew: https://formulae.brew.sh/formula/openjdk
+    - SDKMan: https://sdkman.io/jdks/#open
+- Install a container system (any of the two)
+    - Docker: https://docs.docker.com/engine/install/
+    - Podman: https://podman.io/docs/installation
+
 ## Running the application in dev mode
 
 You can run your application in dev mode that enables live coding using:
 ```shell script
 ./mvnw compile quarkus:dev
 ```
 
-This will start by creating a user with username: 'user', password: 'user' and fetch the
-production data and store it in a postgres dev service database started automatically.
+### Fetching production data
+
+By default, at startup, this will create a user with username: 'user', password: 'user' and fetch the
+production data and store it in a postgres dev service database started automatically (this
+will be started in a container in either docker or podman).
+
+The default production data source can be configured in `src/main/resources/application.properties`:
+
+```xml
+%dev.dev-auto-setup.url=https://2024.rivieradev.fr/Serialiser/json
+```
+
+You can change this to point to other years such as 2025. This will not fetch users, nor speaker emails,
+for confidentiality reasons. This only fetches data which is already public on our website.
 
 ## Packaging for production