Feature : can we add a rounded rectangle?

[Find-NICK]

rounded rectangle Can be like this:

   ╭────────────────────────────────────╮
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   │                                    │
   ╰────────────────────────────────────╯

These four : ╭ ╮ ╰ ╯

[supertxtnet]

When exporting the rounded rectangle it could follow the svgbob convention: https://ivanceras.github.io/content/Svgbob/Specification.html

This is also used in the typogram. https://google.github.io/typograms/#specification