feat: add init-config helper

README.md

@@ -4,6 +4,7 @@
 
 ## Key Features
 
+- `init-config` writes a ready-to-edit config template (respecting `--download-root` and `--force` to overwrite).
 - `auth` subcommand stores Base64-encoded credentials per profile (passwords are never logged).
 - `list-courses` fetches `/users/me`, paginates enrolled courses, infers semester keys, caches the metadata, and prints a concise table.
 - `sync` traverses every course folder/file tree, normalizes names, streams downloads to disk, tracks checksums/remote timestamps, and supports `--dry-run` plus `--prune` to delete orphaned files.
@@ -27,6 +28,9 @@
    ```
 3. **First run**:
    ```bash
+   # Optionally scaffold a config template (safe no-op if it exists)
+   cargo run -- init-config --download-root "$HOME/StudIP"
+
    # Store credentials (prompts for username/password by default)
    cargo run -- auth
 
@@ -63,6 +67,7 @@ max_concurrent_downloads = 3 # placeholder for future concurrency control
 
 | Subcommand | Description | Helpful flags |
 | --- | --- | --- |
+| `init-config` | Write a default config template (fails if config exists unless forced). | `--force`, `--download-root` |
 | `auth` | Collect username/password, encode them, and save them to the active profile. | `--non-interactive`, `--username`, `--password` |
 | `list-courses` | List cached or freshly fetched courses with semester keys and IDs. | `--refresh` |
 | `sync` | Download files for every enrolled course into the local tree. | `--dry-run`, `--prune`, `--since` *(reserved for future API filters)* |