Add 'setup db --download' CLI option

docs/cli.md

@@ -22,9 +22,15 @@ initialize it for the first time, reset it, or download missing data for taxon t
 
 Options:
 ```bash
+-d, --download           Download taxonomy data if it does not exist locally
 -f, --force              Reset database if it already exists
 ```
 
+Example: Full reset and download, with debug logs:
+```bash
+nt -vv setup db -f -d
+```
+
 ### Shell
 The `setup shell` command sets up optional shell tab-completion.
 

naturtag/cli.py

@@ -216,20 +216,32 @@ def setup_group():
 
 
 @setup_group.command()
+@click.option(
+    '-d',
+    '--download',
+    is_flag=True,
+    help='Download taxonomy data if it does not exist locally',
+)
 @click.option(
     '-f',
     '--force',
     is_flag=True,
     help='Reset database if it already exists',
 )
-def db(force):
+def db(download, force):
     """Set up Naturtag's local database.
 
     Naturtag uses a SQLite database to store observation and taxonomy data. This command can
     initialize it for the first time, reset it, or download missing data for taxon text search.
+
+    \b
+    Example: Full reset and download, with debug logs:
+    ```
+    nt -vv setup db -f -d
+    ```
     """
     click.echo('Initializing database...')
-    setup(overwrite=force)
+    setup(overwrite=force, download=download)
 
 
 @setup_group.command()