[mirotalksfu] - add docs

docs/ngrok.md

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+## MiroTalk SFU - Ngrok
+
+If you want to expose MiroTalk SFU from your `Local PC` to outside in `HTTPS`, you need to do 2 things:
+
+1. Add the [Ngrok](https://ngrok.com) `authToken` and change the `announcedIp`
+
+In `app/src/` copy config.template.js to `config.js` then edit it
+
+```js
+    /*
+    Ngrok
+        1. Goto https://ngrok.com
+        2. Get started for free
+        3. Copy YourNgrokAuthToken: https://dashboard.ngrok.com/get-started/your-authtoken
+    */
+    ngrokAuthToken: 'YourNgrokAuthToken', <--- put it here
+
+    announcedIp: 'Your-Public-Static-IP-here' <--- take it from https://api.ipify.org
+```
+
+2. You need to do a `port forwarding` on your router, something like this:
+
+| Name          | Protocol  | Port Wan    | Port Lan    | IP Destination  |
+| ------------- | --------- | ----------- | ----------- | --------------- |
+| `MiroTalkSfu` | `TCP/UDP` | 40000:40100 | 40000:40100 | `Your Local IP` |
+| `MiroTalkSfu` | `TCP`     | 3010        | 3010        | `Your Local IP` |
+
+Make sure your firewall not blocking rtcPorts `range: 40000:40100`
+
+Then, when you run it with `npm start`, you should see in the console log this line
+
+```bash
+server_tunnel: 'https://xxxxxxxxxxxxxxxxxx.ngrok.io'
+```
+
+So open it in your browser, join in the room, share it to whom you want and wait participants to join.
+
+<br/>
+
+## Do you find MiroTalk useful?
+
+Show your appreciation by becoming a [backer or sponsor](https://github.com/sponsors/miroslavpejic85)
+
+Thank you for your support! ❤️
+
+---