readme: D bindings for Ada (#830)

Author: kassane

README.md

@@ -115,6 +115,7 @@ The following libraries are maintained by the Ada team and available under [Ada
 - [Zig](https://github.com/alperencantez/zigada): Unofficial Zig bindings for Ada
 - [Python](https://github.com/TkTech/can_ada): Python bindings for Ada
 - [React Native](https://github.com/KusStar/react-native-fast-url): A Fast URL and URLSearchParams polyfill for React Native.
+- [D](https://github.com/kassane/ada-d): D bindings for Ada, `@nogc`, `nothrow` and `@safe` compat.
 
 ## Usage