add MAX_USERS commented line to env.example

Author: tavdog

.env.example

@@ -3,4 +3,5 @@ SERVER_PORT=8000
 SERVER_PROTOCOL="http"
 SYSTEM_APPS_REPO="https://github.com/tronbyt/apps.git"
 PRODUCTION=1
-LOG_LEVEL=WARNING
+LOG_LEVEL=WARNING
+#MAX_USERS=100 # Default is 100