Update README.md

Author: SHABIN-K

README.md

@@ -87,6 +87,8 @@ python3 main.py
 * `TG_BOT_TOKEN` Your bot token from @BotFather
 * `OWNER_ID` Must enter Your Telegram Id
 * `CHANNEL_ID` Your Channel ID eg:- -100xxxxxxxx
+* `DATABASE_URL` Your mongo db url
+* `DATABASE_NAME` Your mongo db session name
 * `ADMINS` Optional: A space separated list of user_ids of Admins, they can only create links
 * `START_MESSAGE` Optional: start message of bot, use HTML and <a href='https://github.com/codexbotz/File-Sharing-Bot/blob/main/README.md#start_message'>fillings</a>
 * `FORCE_SUB_MESSAGE`Optional:Force sub message of bot, use HTML and Fillings