Add D support

[omdxp]

Is your feature request related to a problem? Please describe. A D package for kuliya.

Describe the solution you'd like A package under d/ folder

TODOs

• [x] #95
• [x] #96
• [x] #97
• [ ] #98
• [ ] #99

Additional context

• https://dlang.org
• https://tour.dlang.org
• https://tour.dlang.org/tour/en/basics/imports-and-modules
• https://tour.dlang.org/tour/en/gems/uniform-function-call-syntax-ufcs
• https://tour.dlang.org/tour/en/gems/string-mixins
• https://tour.dlang.org/tour/en/gems/functional-programming
• https://tour.dlang.org/tour/en/gems/contract-programming
• https://tour.dlang.org/tour/en/gems/attributes
• https://tour.dlang.org/tour/en/gems/documentation
• https://tour.dlang.org/tour/en/gems/unicode
• https://dub.pm/cli-reference/dub-init/
• https://code.dlang.org/packages/asdf
• https://dlang.org/dstyle.html
• https://code.dlang.org/packages/silly
• https://code.dlang.org/packages/dscanner