Update telegram bot readme

examples/honc-telegram-bot/.dev.vars.example

@@ -1 +1,2 @@
+TELEGRAM_API_TOKEN=
 DATABASE_URL=

examples/honc-telegram-bot/README.md

@@ -1,11 +1,35 @@
 ## 🪿 Goose telegram bot
 
-> TODO
+This is a HONC app that allows you operate a telegram bot.
 
-Need to set webhook for the bot.
+### Setup
 
-Which you can do by pinging running:
+In telegram, go to the botfather and create a new bot. This will give you an api token.
 
-```sh
-https://api.telegram.org/bot<YOUR_BOT_TOKEN>/setWebhook?url=<YOUR_WEBHOOK_URL>
-```
+Set this in the `.dev.vars` file as `TELEGRAM_API_TOKEN`.
+
+Next, you need to set webhook for the bot.
+
+You can do this in the Studio UI!
+
+Add a custom route to the Honc app:
+
+```
+POST https://api.telegram.org/:botIdToken/setWebhook
+```
+
+Then fill in the url param for `:botIdToken` with the word "bot" concatenated with your api token.
+
+```
+botMYAPIKEY
+```
+
+Finally, make a post request with the body:
+
+```json
+{
+  "url": "https://webhonc.mies.workers.dev/_YOUR_WEBHONC_ID/webhook"
+}
+```
+
+You should be good to go!