feat: Add new Go solution for loans (#122)

Author: mrangel-jr

loans/SOLUTIONS.md

@@ -6,6 +6,7 @@ Neste tópico, você encontrará uma lista de soluções para o desafio [Emprés
 |:-------------|:-------------------------------------------------------------------------|
 | `C#`         | https://github.com/LucasBaitz/csharp-loans-service                       |
 | `Go`         | https://github.com/josehenriquepg/loans-service                          |
+| `Go`         | https://github.com/mrangel-jr/loans-service                              |
 | `PHP`        | https://github.com/albreis/desafio-emprestimo                            |
 | `Java`       | https://github.com/andre-xizto/loans                                     |
 | `Java`       | https://github.com/alvarengacarlos/Hexagonal-Achitecture                 |