Add services and controllers for games (#12)

Co-authored-by: Maxime Adler <madler@sqli.com>
Reviewed-on: #12

src/GameIdeas/GameIdeas.Shared/Dto/PlatformDto.cs

@@ -0,0 +1,8 @@
+namespace GameIdeas.Shared.Dto;
+
+public class PlatformDto
+{
+    public int? Id { get; set; }
+    public string? Label { get; set; }
+    public string? Url { get; set; }
+}