support Appimage

[newyorkthink]

Describe the bug A Description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

System information:

• Cassowary Linux client version: [run python3 -m cassowary -h to find version ]
• Cassowary windows component version: [run "C:\Program Files\cassowary\cassowary.exe" -h to find version]
• Linux Distribution: [e.g. Arch Linux]
• Windows/Edition used [e.g. 10/enterprise, 7/ultimate]

Additional context Add any other context about the problem here.