add new environment variables for spotDL configuration and output format control

changelogs/0.1.9.md

@@ -78,6 +78,20 @@ MUSIC_STORAGE_BASE_PATH = '/storage/media/music'
 ### 🆕 Log Viewer
 Under the `Admin`  Page there is now a tab called `Logs` from where you can view the current logs, change the log-level on demand and copy a prepared markdown snippet ready to be pasted into a GitHub issue. 
 
+### 🆕 New env var´s, a bit more control over spotDL
+#### `SPOTDL_PROXY` 
+Set a Proxy for spotDL. See [https://spotdl.readthedocs.io/en/latest/usage/#command-line-options](https://spotdl.readthedocs.io/en/latest/usage/#command-line-options)
+#### `SPOTDL_OUTPUT_FORMAT`
+Set the output folder and file name format for downloaded tracks via spotDL. Not all variables, which are supported by spotDL are supported by Jellyplist. 
+- `{title}`
+- `{artist}`
+- `{artists}`
+- `{album}`
+
+This way you will have a bit more controler over how the files are stored. 
+The complete output path is joined from `MUSIC_STORAGE_BASE_PATH` and `SPOTDL_OUTPUT_FORMAT`
+
+
 
 ### Other changes, improvements and fixes
 - Fix for #38 and #22 , where the manual task starting was missing a return value