Added Shelly Wall Switch Variants

[jdambacher]

Blueprint Checklist

• You viewed the README and conformed to the naming conventions
• You ordered the actions as stated in the README action order
• All filenames are lowercase and uses '-' for spaces and not '_' while using {service-name}-{switch-name-or-type}.yaml format
• Images are png
• Image backgrounds are transparent and is cropped to the device boundries
• Images has a maximum width of 800px and maximum height of 500px
• There are no missing buttons or actions
• Your integration/service is running on the latest version
• You have tested your blueprints and made sure each button and action works

[Sian-Lee-SA]

What is buitton down and button up? is button down something that happens all the time when the button is pushed regardless the underlying action? if so then it should be init

[jdambacher]

@Sian-Lee-SA Thanks for your comment. Yes, it's init and released. I just changed that.