Add FAQ and describe about cookies.txt

README.md

@@ -110,6 +110,22 @@ gdown.download_folder(id=id, quiet=True, use_cookies=False)
 ```
 
 
+## FAQ
+
+### I get 'Permission Denied' error.
+
+Have you made sure you set the file permission to 'Anyone with Link'?
+
+### I set the permission 'Anyone with Link', but still can't download.
+
+Google restricts access to a file when the download is concentrated.
+If you can still access to the file from your browser, downloading cookies file might
+help. Follow this step: 1) download cookies.txt using browser extensions like
+([Get cookies.txt LOCALLY](https://chromewebstore.google.com/detail/get-cookiestxt-locally/cclelndahbckbenkjhflpdbgdldlbecc));
+2) mv the `cookies.txt` to `~/.cache/gdown/cookies.txt`; 3) run download again.
+If your Gdown is new enough, it should be able to use the cookies same as your browser.
+
+
 ## License
 
 MIT