updated readme

README.md

@@ -7,6 +7,9 @@
 
 - To receive Telegram message, you first need to authorize with CallMeBot_txtbot bot, only then you will receive messaages. To authorize with the bot <b>[go here](https://t.me/CallMeBot_txtbot)</b>. This bot is not owned by me and for more information about the bot, <b>[visit here](https://www.callmebot.com/)</b>
 - After successfull authorization with the bot you can start using the website, either from [here](https://aswinkr77.github.io/Vaccine-Slot-Availability-Notifier/) or locally by downloading it. Just clone or download the package. For mobile users running locally will gonna be a headache, so for you a mobile optimised html file is there called mobile_index.html, use it.
+- The app needed to be run on the background, so never close the browser or the tab where the app is running.
+- After clicking on start, the app searches recursively for any available slot in the particular district and only stops when a slot is available on when you click on stop.
+- If you type in a Telegram Username which is not authorised with the CallMeBot bot, the App won't run and as of now no error message will be displayed. So make sure you have authorised with the bot.
 
 ## This is an experimental project
 You may experience bugs or errors when running the app and feel free to contact me or create a PR