Update README.md

https://t.me/stkrz_bot (@stkrz_bot) – a bot for creating custom text sticker packs. The bot hosts single Mini App, which acts as a user interface for the bot.

README.md

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 You can test and develop your MiniApps in Telegram test environment, which is completely separate from the main environment.
 For that you'll have to create new separate account and a bot with @BotFather.
 Don't forget to set environment variable `DEV=true` in `server/.env` to perform API calls to test environment as well.
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 [Learn more](https://core.telegram.org/bots/webapps#testing-mini-apps)
 
 ### Ngrok