use setuptools to make egg file

Signed-off-by: apporc <appleorchard2000@gmail.com>
move config.json to $HOME/.config/shadowsocks-gtk/

Signed-off-by: apporc <appleorchard2000@gmail.com>
Fix serverlist, default server connection

Signed-off-by: apporc <appleorchard2000@gmail.com>
Add screenshot in readme

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Update README

Signed-off-by: apporc <appleorchard2000@gmail.com>
Update README

Signed-off-by: apporc <appleorchard2000@gmail.com>