add short example of a config file

Author: BerndDoser

docs/hipster.md

@@ -1,13 +1,26 @@
-# Generate HiPS and catalog
+# HiPSter: Generate HiPS and catalog
+
+The following command generates a HiPS representation and a catalog showing the real images located
+on the latent space using the trained model.
 
-The following command generates a HiPS representation and a catalog showing the real images located on the latent space using the trained model.
 
 ```bash
 hipster --checkpoint <checkpoint-file>.ckpt
 ```
 
 Call `hipster --help` for more information.
 
+Example of a HiPSter config file:
+```yaml
+root_path: HiPSter
+html:
+  url: http://localhost:8083
+  title: HiPSter representation of Gaia XP DR3
+  aladin_lite_version: latest
+tasks:
+  <list of tasks>
+```
+
 For visualization, a Python HTTP server can be started by executing `python3 -m http.server 8082` within the HiPSter output file.