add readme.md

README.md

+Fichier de configuration `config.js`
+
+``` js
+const config = {
+    telegram: {
+        token: '',
+        admin_chat: 
+    },
+    oauth2: {
+        clientid: '',
+        secretid: '',
+        scope: 'default linkcs-asso:read linkcs-user:read'
+    },
+    website: {
+        hostname: '',
+        protocol: '',
+        port: 
+    },
+    mysql: {
+        host: '',
+        user: '',
+        password: '',
+        database: ''
+    }
+};
+
+module.exports = config;
+```
\ No newline at end of file