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.api/appsettings.Development.json

@@ -0,0 +1,22 @@
+{
+  "ConnectionStrings": {
+    "Default": "Host=localhost;Port=5432;Database=mws;Username=postgres;Password=Pa55w0rd"
+  },
+  "Jwt": {
+    "Secret": "mws-development-secret-key-change-me-in-production-123456",
+    "Issuer": "Mws",
+    "Audience": "Mws.Clients",
+    "Expiration": "12:00:00"
+  },
+  "Cors": {
+    "Origins": "*"
+  },
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}