docs: Update README to include configuration steps

Author: maxnatamo

README.md

@@ -48,7 +48,7 @@ docker run -d \
     ghcr.io/fetcharr/fetcharr:latest
 ```
 
-If you prefer a more *declarative* way of starting Fetcharr, use this `compose.yaml` file:
+If you prefer a more *declarative* way of starting Fetcharr, you can use this `compose.yaml` file:
 
 ```yaml
 services:
@@ -62,6 +62,9 @@ services:
     restart: unless-stopped
 ```
 
+Copy the [`config.example.yaml`](./config.example.yaml)-file to your configuration folder as `config.yaml` and edit it to your liking.
+When you've changed the config-file, remember to restart Fetcharr for it to take effect.
+
 ## 📝 Contributing
 
 If you want to contribute, great! We'd love your help!