README.md: ajout mention sur XMPP Providers

README.md

@@ -720,6 +720,36 @@ sudo -u www-data git merge vxxx
 sudo -u www-data composer install
 ```
 
-
+# Participation à XMPP Providers
+
+La participation à [XMPP Providers](https://providers.xmpp.net) implique la création du fichier `/var/www/html/xmpp-provider-v2.json` :
+
+```
+{
+  "website": {
+    "fr": "https://www.chalec.org/services/xmpp/"
+  },
+  "alternativeJids": [],
+  "busFactor": 3,
+  "organization": "non-governmental",
+  "passwordReset": {},
+  "serverTesting": true,
+  "maximumHttpFileUploadTotalSize": 500,
+  "maximumHttpFileUploadStorageTime": 30,
+  "maximumMessageArchiveManagementStorageTime": 30,
+  "professionalHosting": true,
+  "freeOfCharge": true,
+  "legalNotice": {
+    "fr": "https://www.chalec.org/mentions-legales.html"
+  },
+  "serverLocations": [
+    "fr"
+  ],
+    "since": "2022-08-10"
+  }
+}
+```
+
+Il faut mettre ce fichier à jour lors d'un changement de politique.