Add instructions for how to set up telegram bot

README.md

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+# Set up a telegram bot
+- Open telegram, find BotFather and type /start and /newbot
+- Once created, BotFather will tell you the token to access the HTTP API. Add this as an env: TELEGRAM_BOT_TOKEN
+- /setprivacy @MyBotName to Enable - this means the bot will only listen to messages beginning with / or tagging the bot by name
+- Create a group, add the bot and any users. 
+- add IDBot or similar to get the chat id, and add as an env: TELEGRAM_CHAT_ID
+- Set the webhook for the bot:
+    -  curl -F "url=https://abc123.ngrok.io/webhook" https://api.telegram.org/bot<YourBOTToken>/setWebhook
+    - If it changes, delete it with curl https://api.telegram.org/bot<YourBOTToken>/deleteWebhook