Support image file readering

The more we know about your system and use case, the more easily and likely we can help.

Environment info

• OS: Windows 10
• App Version (Command/Ctrl + ,): v1.5.1-alpha-1

Description of the problem / feature request / question:

essentially, gist is a repo, user can add any file to the repo. include image file, like .jpg ,png etc. Hope Lepton support image file, even upload image file

If possible, provide a sample gist or screenshot:

If possible, provide the log files

• Mac: ~/Library/Application Support/Lepton/logs
• Windows: C:\Users\<username>\AppData\Roaming\Lepton\logs
• Linux: ~/.cached/Lepton/logs

The debug mode is recommended when producing the logs. You can send your log file to [email protected] if don't want to post it here.