Build Support for D Language

1st chunk of `pkgs/build-support/dlang/README.md`

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# Build support for D

Build utilities for the D language can be found in this directory.

### Current maintainers
- @TomaSajt
- @jtbx

Title: Build Support for D Language

Summary

This directory contains build utilities specifically for the D language. The current maintainers for these utilities are @TomaSajt and @jtbx.