D Ryu implementation reference (#194)

Author: 9il

README.md

@@ -89,6 +89,7 @@ Other implementations of Ryu:
 | Go               | Caleb Spare        | https://github.com/cespare/ryu                |
 | C++              | Cqwrteur           | https://github.com/expnkx/fast_io             |
 | C#               | Dogwei             | https://github.com/Dogwei/RyuCsharp           |
+| D                | Ilya Yaroshenko    | [https://github.com/libmir/mir-algorithm][5]  |
 | Scala            | Denys Shabalin     | [https://github.com/scala-native/scala-native][4] |
 
 
@@ -100,6 +101,8 @@ Other implementations of Ryu:
 
 [4]: https://github.com/scala-native/scala-native/tree/master/nativelib/src/main/scala/scala/scalanative/runtime/ieee754tostring/ryu
 
+[5]: https://github.com/libmir/mir-algorithm/tree/master/source/mir/bignum/internal/ryu
+
 ## Ryu Printf
 Since Ryu generates the shortest decimal representation, it is not immediately
 suitable for use in languages that have printf-like facilities. In most