Commit MWS backend source tree

The ASP.NET Core solution (mws.api/mws.application/mws.domain/
mws.infrastructure) existed only as untracked working files. Adding
it to version control, plus a .gitignore for build output and local
tooling directories, so the CQRS/mediator refactor plan has a real
git history to branch and diff against.

mws.infrastructure/Authentication/JwtOptions.cs

@@ -0,0 +1,9 @@
+namespace Mws.Infrastructure.Authentication;
+
+public class JwtOptions
+{
+    public string Secret { get; set; } = string.Empty;
+    public string Issuer { get; set; } = "Mws";
+    public string Audience { get; set; } = "Mws.Clients";
+    public TimeSpan Expiration { get; set; } = TimeSpan.FromHours(12);
+}