improve/create documentation

README.md

@@ -0,0 +1,23 @@
+# Download unseen files from a folder in Google Drive
+Example:
+~~~
+cd ~/Documents
+drive-download scanbot
+~~~
+
+The script only downloads files it hasn't seen before.
+
+## Configuring
+1. Get Google Drive API id and secret from the Google API console.
+2. Create and edit `.config/drive-download/settings.yaml`:
+
+~~~
+client_config_backend: settings
+client_config:
+  client_id: XXX.apps.googleusercontent.com
+  client_secret: _s3cr3deadc4fef00baR
+
+  save_credentials: True
+  save_credentials_backend: file
+  save_credentials_file: /home/USERNAME/.cache/drive-download/credentials.json
+~~~

drive-download

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# Download unseen files from a folder in Google Drive
 
 import sys
 if sys.version_info < (3, 3):
@@ -39,7 +40,8 @@ def folder_id(folder_name):
 def main():
     global seen, drive
 
-    parser = argparse.ArgumentParser(description='Download files from a folder in Google Drive')
+    parser = argparse.ArgumentParser(
+        description='Download unseen files from a folder in Google Drive')
     parser.add_argument('folder', type=str, help='folder to download from')
     args = parser.parse_args()