Adds docs about serving octane in HTTPS (#229)

* Adds docs about serving octane in HTTPS

* Update README.md

Co-authored-by: Taylor Otwell <[email protected]>

Author: nunomaduro

README.md

@@ -116,6 +116,14 @@ php artisan octane:start
 
 By default, Octane will start the server on port 8000, so you may access your application in a web browser via `http://localhost:8000`.
 
+#### Serving Your Application Via HTTPS
+
+By default, applications running via Octane generate links prefixed with `http://`. The `OCTANE_HTTPS` environment variable, used within your application's `config/octane.php` configuration file, can be set to `true` when serving your application via HTTPS. When this configuration value is set to `true`, Octane will instruct Laravel to prefix all generated links with `https://`:
+
+```php
+'https' => env('OCTANE_HTTPS', false),
+```
+
 #### Watching For File Changes
 
 Since your application is loaded in memory once when the Octane server starts, any changes to your application's files will not be reflected when you refresh your browser. For example, route definitions added to your `routes/web.php` file will not be reflected until the server is restarted. For convenience, you may use the `--watch` flag to instruct Octane to automatically restart the server on any file changes within your application: